Switching carriers or using a different SIM card on your iPhone doesn’t have to be complicated. If your device is SIM-locked, ...

Phone suddenly showing "No SIM" or "Invalid SIM"? Don't panic, there are a few quick checks that can get you reconnected fast ...

Want to use your Galaxy Note 8 on any carrier you want? Here's how to SIM unlock the Galaxy Note 8 right from home.

In this guide we’ll show you how to SIM unlock the Galaxy S9 so you can use it on different carrier networks. That way if you bought the Galaxy S9+ from AT&T, you can still take it to T-Mobile ...

The device will prompt you to enter the code after turning it on, when the SIM PIN lock is enabled or turned on. Here’s how to lock and unlock the SIM card on your Galaxy Note 5 handset: ...

The Apple iPhone 4S is promoted as a world phone, but international travelers should be aware of what that means. I also went through the process and can answer your questions.

There are other ways to bypass iPhone SIM lock, but most of them require a bit more hassle. You can use IMEI unlock service or UnlockBoot online service, but it can be quite pricey.

What does SIM lock actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.