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Most of us geekier folks instantly know if our iPhones are CDMA or GSM models, but not everyone pays as much attention to the largely insignificant technical details of their phones. Not to worry, it’s extremely easy to find out if an iPhone is GSM or CDMA, all you need to do is look at the model number of the device.

To find out if the phone is CDMA or GSM, flip the iPhone over and look at the back. Locate the string number alongside “Model” as highlighted in this image, and then and compare it against the list below:

Once you have made note of the model shown on the back of the phone, you can determine if it’s GSM or CDMA by matching it:

iPhone GSM Model Numbers

iPhone 5: A1429 (* World GSM & CDMA)

iPhone 5: A1428

iPhone 4S: A1387 (* dual band CDMA & GSM world phone)

iPhone 4S: A1531 (GSM China)

iPhone 4: A1332

iPhone 3GS: A1325 (GSM China)

iPhone 3GS: A1303

iPhone 3G: A1324 (GSM China)

iPhone 3G: A1241

iPhone 1: A1203

iPhone CDMA Model Numbers

iPhone 5: A1429 (* World GSM & CDMA)

iPhone 4S: A1387 (* dual band CDMA & GSM world phone)

iPhone 4: A1349

Once you have made note of the model shown on the back of the phone, you can determine if it’s GSM or CDMA by matching it:

Knowing the model numbers is guaranteed and is pretty quick, and it’s also the best way to determine what model an iPhone is that won’t turn on. For customers in the USA, another easy way to tell if it’s GSM or CDMA is just to find out what cell carrier the iPhone uses. AT&T is always GSM, T-Mobile is always GSM, while Verizon and Sprint are always CDMA. You can also generally assume that if it uses a SIM card to get online, it’s a GSM iPhone, though some iPhone models like the iPhone 4S have both CDMA and GSM capabilities. The cell carrier isn’t always a reliable method though, because sometimes an iPhone won’t turn on, is out of battery or just plain dead, or it could even be a dualband world phone like the 4S.

What if the iPhone Model Number is Rubbed Off?

If the model number isn’t entirely clear, or it has worn off, you can still identify the device through iTunes to find similar information about the phone.

If that isn’t an option, you can also check on the device itself by opening Settings, tap General then “About”, and look under “Network” or “Carrier” instead, you’ll then need to just figure out of the carrier is GSM (AT&T, T-Mobile) or CDMA (Sprint, Verizon).

Why Does it Matter?

For the vast majority of iPhone users, it doesn’t, they’ll never need to know or care about their device being GSM or CDMA. This is really mostly helpful to those who use IPSW (IPSW is iOS firmware, basically the iPhone system software) to either update a device manually, for jailbreaking purposes, or for restoring a device in the event of a significant software failure. In that case, knowing which model a device is important when downloading IPSW files for iPhones.

Thanks for the tip jlfafi!


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Excel Test If A Range Contains Text, Numbers Or Is Empty

I received an email from Bill this week asking how he can check if a range of cells contains text or numbers, as opposed to being empty.

We can use the ISTEXT function to test for text, and ISNUMBER function to test for numbers, but these only work on one cell at a time.

Here’s the syntax:



Where ‘value’ is the reference of the cell you want to test.

We can see them in action in the image below:

But Bill wants to test the whole range, A4:A10, to see if any cells contain text or numbers.

To check a range we can combine the ISTEXT and ISNUMBER functions with SUMPRODUCT like this:

So, how does this Beauty work?

Although this isn’t strictly an array formula, in that you don’t have to enter it with CTRL+SHIFT+ENTER, the SUMPRODUCT function behaves just like an array formula.

Let’s look at how it evaluates:

Step 1 – ISTEXT returns an array of TRUE/FALSE for each cell in the range A4:A10 like so:

Step 2 – ISNUMBER also returns an array of TRUE/FALSE for each cell in the range A4:A10 like so:

Step 3 – Now, since TRUE/FALSE have equivalent number values of 1 for TRUE, and 0 for FALSE when we apply the + to the two arrays inside the SUMPRODUCT function it converts them to their numeric equivalent like so:

Step 4 – SUMPRODUCT then adds the 1’s and 0’s together:

Step 5 – it tests whether the result of the SUMPRODUCT formula is greater than 0. If it is it returns TRUE, if not FALSE.

Array Formula Option

Of course we could achieve the same result from this array formula:

Although this is slightly shorter to write, remember because it’s an array formula we need to enter it with CTRL+SHIFT+ENTER.

Return a Different Message

If you want to return a ‘Yes’ or ‘No’, as opposed to the TRUE/FALSE outcomes, we can do this with an IF function like so:

Test for Numbers Only

Note the difference in this formula is the *1 after the ISNUMBER test.  This is to coerce the TRUE/FALSE values into their numeric equivalents of 1 and zero.

We didn’t have to do this in the original formula because the + in the SUMPRODUCT function did that for us:

Another way to coerce TRUE/FALSE values is with the double unary like so:

Test for Text Only

Or with the double unary:

Test if a Range is Empty

We can use the ISBLANK function to test if a cell is empty, but like ISTEXT and ISNUMBER, it only works on one cell at a time. The solution is to use SUMPRODUCT to test a range of cells and then compare the result to the number of cells in the range like so:


The ISBLANK function returns a TRUE for every blank cell, which we then coerce into the numeric equivalent using the double unary – -.

The ROWS function returns the number of cells (or rows) in a range.

Using the original data as our example:

The ISBLANK formula evaluates like this:

=SUMPRODUCT({1,0,0,1,0,0,0})=7   =2=7   =FALSE

If the range A4:A10 were empty it would evaluate like this:

=SUMPRODUCT({1,1,1,1,1,1,1})=7   =7=7   =TRUE

Now, if you’ve read this far and are keeping up with me then you might be thinking, ‘can I use ISBLANK to test if any cells contain text or numbers instead of the original ISTEXT/ISNUMBER formula?’

The answer is yes, like this:

In English: if the number of BLANK cells in the range A4:A10 is not equal to the number of rows in the range A4:A10 you will get TRUE, meaning there is at least one cell in the range that isn’t blank.

The downside of this option is the double negatives can do your head in, whereas interpreting the ISTEXT and ISNUMBER formula is a bit less draining on your brain power 🙂

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Thank you to Bill for inspiring this tutorial.

How To Play Habbo On Iphone Or Ipad

Habbo is a popular online community based upon a virtual hotel where you can create a character, decorate rooms with virtual furniture, chat with others, play mini-games, organize events and more. Sulake launched the game in Finland in 2000 and has since expanded it to Australia, Canada, United Kingdom, United States and other regions over the past decade. On the desktop, it was originally a Shockwave-based game that has since transitioned to Adobe Flash.

As you probably know, Adobe Flash has never been supported on the iPhone, iPad or iPod touch. In fact, over four years ago, Steve Jobs published an article called Thoughts on Flash to explain why Apple is so inexplicably against supporting the platform on its iOS devices. As such, it is impossible to play Habbo through Safari by traditional means. That is no reason to be worried, however, as there are actually a few options for playing Habbo on an iPhone or iPad. Take a look… 

Habbo for iPad

In a world where mobile device adoption continues to rise, Sulake has finally conceded and released Habbo for iPad. The app has soft launched in Canada on the App Store, and will make its debut in the United States and several other countries in the near future. Habbo for iPad is far from perfect, but it does replicate most of the functionality and gameplay from the traditional desktop version of the game.

There are still some missing features, including the inability to private message friends, but the team of developers at Sulake will continue making improvements to the app over time. The Finnish-based team also confirmed that an official Habbo app will be released for select Android tablets in late 2014. Habbo Club memberships and credits can be obtained as in-app purchases, such as a 95 credit pack for $9.99.

Habbo for iPad is free on the App Store.

Pocket Habbo

If you are simply looking to message other Habbo players from your iPhone or iPad, then Pocket Habbo is for you. The app allows you to chat with both online and offline players that are on your in-game friends list. You can also view the profiles of you and others, including friend counts, join dates, groups and badges. Pocket Habbo does not allow you to play Habbo itself, but it is definitely a good companion app to have.

Pocket Habbo is free on the App Store for iPhone, iPad and iPod touch.

Flash Browsers for iPhone and iPad

As there is no official Habbo app for the iPhone or iPod touch, users of these devices will have to resort to the App Store for third-party browsers that support Flash. But with a 3.5-inch or 4-inch screen, you cannot expect gameplay to be all that great. Even if you do manage to get Habbo loaded through one of these browsers, which is more than possible, prepare yourself for a lot of lag and glitches.

It is also very challenging to type into the in-game chat box from an iPhone or iPod touch, making talking with others more trouble than it is worth. Nevertheless, below are two good Flash-enabled browsers for iOS devices. There are plenty of alternatives such as SkyFire, but those type of browsers can often only be used to play Flash videos — not games. Puffin is a tried and trusted option for Habbo.

To use Adobe Flash without the off-peak hours restriction, the full version of

To use Adobe Flash without the off-peak hours restriction, the full version of Puffin Web Browser is also available for $3.99 on the App Store . The developers of the browser recommend that you purchase the free version before the paid one, to ensure that it meets your needs. It is important to note that the Puffin data center is located in the United States, and the cloud servers can only communicate with websites that have a U.S. geolocation.

Habbo is an iconic game that has seemingly dropped in popularity over the years, perhaps because of the rise of the App Store and mobile gaming. But with the release of Habbo for iPad, alongside Pocket Habbo and Flash-based browsers, there is a chance that the game can gain some traction again as it approaches its fifteen-year anniversary. The virtual hotel is still accessed by millions of teenagers around the world, so there is no reason it should be closing its doors any time soon.

How To Check If A File Is Safe For Downloading

The internet has many websites that claim they have the correct file. Most of the time, you have to open the file to confirm the file is safe. And by that time, it may be too late to protect your PC from malware and virus programs.

This type of scenario is common on many websites. The pop-up may take you to a shady website where downloading files puts your PC at risk. If a pop-up appears, it is best to close it right away and try again.

Torrents is a highly popular P2P file-sharing website. Typically files found in torrent sites are copyrighted or commercial material. Most of them are provided by anonymous sources and there is no telling if the file is tampered with.

Applications downloaded from torrents may or may not be the applications you want. There is no incentive to provide the right file for downloading as a torrent. You may be downloading a malware program or a virus on your PC.

Apart from the legal aspect, torrents are highly unsafe for downloading files. You should avoid downloading torrents from unknown users. To confirm a file is safe, you have to download it from a known, trusted source.

HyperText Transfer Protocol is the backbone of the internet. Internet browsing and downloading works in a stream of HTTP requests and responses. Simply put, HTTPS is encrypted HTTP. Secure encryption ensures that the website you are visiting is trusted.

To protect yourself from download threats, always perform a safety check before downloading. Continue reading below to know some of the regular safety approaches to download a file.

Depending on the type of Antivirus you have, you can do a file check before or after performing a download.

Know your file formats. Whether a new or old Windows user, always make sure to enable file extensions in Explorer by default. It’s a security hazard that they turn it off by default. Turn it on from the explorer File options .

Many websites such as Fileinfo lets you search from their large database of file extensions. File extensions are three or four characters long. They are the last characters after the period (.) shown in the file name.

Note that these two factors are not complete indications of the validity of a file. They only tell you whether a file is trusted and downloaded by other users.

Md5 sum file hash is a popular means of verifying any file. Md5 algorithm takes a file and generates a 128 character unique hash. This way, if the download file is tampered with, the resulting hash would be different. 

Many download websites offer md5 hash along with the download link. With it, you can verify if the file you get is the same as the one they provide. This is a good approach if you trust the file provider to let you download your file safely.

Note that you would still have to download the file first before you can start checking it. You should open the file only after you’re sure it’s safe to do so.

Note down the file hash next to the download link.

Go to any online md5 hash checker tool.

Upload the file and let the tool generate hash for you.

Compare the file hashes together to make sure they are the same.

Windows Sandbox is a special feature provided by Microsoft as a testing ground. Even if you manage to break your sandboxed Windows, it won’t have any impact on your base Windows at all. So, it is a good idea to test all your suspicious download links in a sandbox environment.

Note that the feature is available in Pro and Enterprise versions only. Other Windows users can use a virtual box or VMware image instead.

Forums are the place to confirm the validity of any file. Most of the download websites provide a discussion forum for site visitors. Anyone can register for an account in the discussion forum and post their questions. Other experienced users can write answers and even upvote questions and answers.

Some users even make time to point you to the correct file that you’d need to download. Since anyone can post on the forums, you still need to be careful in believing what you read. I always recommend taking the file forums with a large pinch of salt.

Virustotal is a reliable site to perform safety checks. It has two modes, the first file mode and the second is link mode. File mode allows you to upload a file and verify if it’s safe. Link mode allows you to run a safety check even before downloading the file.

Virustotal runs virus scans against a database of multiple vendors. It then reports if the file passed all safety checks. For now, we will stick to using link mode.

To disable the automatic downloading of files, follow these steps.

Chrome Firefox Safari

Go to the Safari menu and select Preferences.

Under the General tab, select a File download location.

Select Ask for each download.

Under the General tab, select a File download location.

Select Ask for each download.

How To Setup A Printer On Iphone Or Ipad

Thanks to Apple’s AirPrint protocol, printing on iPhone, iPad, and iPod Touch is easier than you think. You only have to spend a little time setting up your printer before you can start using it with an iOS or iPadOS device.

But what if you have a printer that doesn’t support AirPrint? Don’t worry. You can still rely on your printer manufacturer’s support app to send print jobs wirelessly. Also, if you use a wired-only printer, you can opt for a third-party AirPrint activator to help you out.

Table of Contents

Use AirPrint to Print on iPhone and iPad

AirPrint is a wireless protocol by Apple that allows the iPhone iPad to communicate wirelessly with printers. It requires zero drivers or support software. The only thing you must do is make sure that the printer and your iOS device are on the same Wi-Fi router. If they are, you can print right away!

If you use a recent printer with wireless capabilities, chances are that it’s AirPrint-compatible. Here’s a complete list of compatible printer models featuring AirPlay support. If your printer is not listed there, skip to the next section.

1. Start by connecting your printer to the same wireless network router as your iPhone or iPad. You must check your printer’s user manual or online documentation for specific instructions. For example, if you use an HP printer with a touchscreen, open the Network or Wireless settings menu and use the Wireless Setup Wizard to join the network.

2. Open (or select) the image, document, or web page you want to print and tap the Share icon. It’s shaped like an arrow coming out of the top of a box and is present on most apps (e.g., Files, Photos, and Safari) on the iPhone and iPad. Then, tap the Print option on the Share Sheet.

3. Tap the Select Printer option at the top of the screen. If your printer supports AirPlay (and you’ve connected to the same wireless network as your iPhone or iPad), it will appear within the list. Tap to select it.

Learn what you can do to troubleshoot an AirPrint printer that fails to show up on your iPhone or iPad.

4. Make any adjustments to the print job, such as the number of copies, media quality, paper size, etc. Then, tap Print on the right corner of the screen. Your AirPrint printer will start printing immediately. 

Note: Learn what you can do to troubleshoot an AirPrint printer that fails to show up on your iPhone or iPad.

Use Printer Support Software to Print on iPhone and iPad

If your wireless printer doesn’t support AirPrint, you must install any available support software from the App Store. For example, printing apps such as Canon PRINT Inkjet/SELPHY, Epson iPrint, and HP Smart let you print wirelessly from your iPhone or iPad. These apps also provide additional customization options for AirPrint-compatible printers, so you may still want to install them regardless. 

Here’s a brief rundown of the HP Smart app in action.

1. Install HP Smart from the App Store.

2. Open HP Smart and create an HP account (or sign in if you already have one).

3. Tap the Add Your First Printer option to add an HP printer.

Note: If your wireless printer doesn’t show up, make sure that it’s connected to the same Wi-Fi network as your iPhone or iPad. Or enter its IP address. If the printer uses Bluetooth for connectivity, remember to activate the Bluetooth radio on iPhone and iPad.

4. Tap on a category (e.g., Print Photos or Print Documents) to create a print job.

5. Tap Print to send the print job to your HP printer.

Note: If your print jobs fail to go through, work through these troubleshooting tips to fix your wireless printer.

Use Printopia or O’Print to Print on iPhone and iPad

Suppose you use a non-AirPrint wireless printer without support software or a wired-only printer. In that case, it’s possible to print from iPhone or iPad by sending print jobs wirelessly through desktop devices. For that, you need third-party apps for the Mac or PC that simulate AirPrint.

Printopia is a paid app for the Mac that costs $19.99, but it comes with a free 7-day trial. It lets you add up to five printers for use with your iPhone or iPad. However, don’t expect it to work with Android smartphones.

After downloading and installing Printopia, open it and switch to the Printers tab. Then, select the Plus button to add a printer. If it doesn’t show up, make sure to connect the printer to your Mac first.

Then, assuming that your Apple devices are on the same Wi-Fi network, open the photo, document, or webpage you want to print on your iPhone or iPad and tap the Share button. Your printer will then appear within the printer selection pane. Select it, make the required adjustments for the print job, and tap Print.

Download, install, and open O’Print. You should then see any printers you’ve already added to your PC. If not, here’s how to add new printers on Windows.

By default, O’Print enables all printers (including PDF printers) for the iPhone and iPad. Simply select the green icon next to a printer to deactivate it.

Following that, start a print job on your iPhone or iPad, and you should be able to select your printer. Then, modify the print job as needed and tap Print.

Print on Any Printer From iPhone and iPad

How To Enable Bold Text On Iphone Or Ipad

Want to make the fonts and text on your iPhone or iPad a bit easier to read? Then you might want to try out the Bold Text option available in iOS, which might improve text legibility for some users. Also, some people might simply prefer the way the bolder text looks throughout apps, and want to try it out for that reason alone.

Whether you just like the look of bolder text, or if you find the screen text on an iPhone or iPad to be difficult to read or the fonts to be a bit thin, enabling the bold fonts setting in iOS can make a big difference for some users ability to read text on screen. As the name implies, Bold Text quite literally bolds most of the onscreen text in iOS found in apps and throughout iOS itself, sort of like you would bold text yourself in a word processor app except that it applies everywhere, making the fonts and text far more legible for many users, particularly those who are not a fan of the default font weight and size.

The bold text option is available for both iPhone and iPad and is quite easy to enable, here’s how you can use it.

How to Enable Bold Text on iPhone and iPad

Open the “Settings” app in iOS

Go to “Display & Brightness”

Scroll down to find ‘Bold Text’ and toggle the switch to the ON position

Accept that you will restart the iPhone or iPad for Bold Fonts to take effect

When the iPhone or iPad completes rebooting, the iOS device will have bold fonts enabled, which should be immediately noticeable on the lock screen and on the Home Screen of any iPhone or iPad. If you explore around in other apps, you should immediately notice the difference in font weights elsewhere as well.

For a visual example (if want to have an idea of what to expect without toggling the setting yourself yet), the animated GIF image below shows a Home Screen of an iPhone with Bold Fonts OFF and then with Bold Fonts ON. If you look at the names of the app icons you should see a notable difference as the animated image changes between the two options, and the clock font is bolder as well:

Here’s a side-by-side comparison of it looks like when Bold Text enabled and disabled within the text of the iOS Settings app itself:

It’s not just the Settings app and Home Screen that will have bolder text however, and most apps will start using bold fonts and bold text as well, at least for the in-app fonts used in the app display. The bolding of the fonts can make the more legible to many users, and because the setting is widely adopted enabling it can make just about all text on screen easier to read for many iPhone and iPad users.

Note that using the Bold Text setting will have no impact on text on websites with something like Safari. If you want to make the size of text larger on a webpage, using Safari Reader Mode on iPhone or iPad can be great for that purpose.

Speaking of making text larger, the same Display & Brightness settings section in iOS also includes a ‘text size’ slider which can also be helpful for making on-screen text more legible. If the default text size options aren’t sufficient, you can enable extra large font sizes on iPad and iPhone with an Accessibility setting explained here.

Readability of screen text is one of the more common complaints for many tech users, whether they’re on an iPhone, iPad, Mac, Windows PC, or Android device, and features like Bold Text in iOS can help for many users. While Bold Text is available for iOS on iPhone or iPad, unfortunately there is not a similar setting available on the Mac, even as an accessibility option.

Note the Bold Text option was originally introduced as an Accessibility option in older iOS versions, but has now been relocated to the general Display & Brightness preference panel. Thus if you’re on a modern iOS release the instructions are as covered here, whereas earlier iOS versions may have to look in Accessibility instead.


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