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

How to Use Your Unlock Code Once you have acquired your SIM unlock code, follow these steps: Turn off your phone and insert the new SIM card.

This new device from Brando claims to have the ability to unlock your iPhone on the SIM level by attaching to the card. It will work with any firmware, ...

To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

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

If you're a new T-Mobile customer or you recently purchased a new phone, you may have a new SIM card you'll need to activate. Here's how to set it up.

You just received a brand new SIM card for your iPhone, and you want to start using it pronto. But you're not sure how to activate it. Don't worry. Activating a new SIM card on your iPhone is a ...

If you've just got your hands on a shiny new Sim card, congratulations. Switching your Sim (the chip that dictates your allowance) can unlock huge savings. Now comes the crucial step of activating it ...