Call the carrier’s customer service to verify your SIM card ownership. Alternatively, if supported, email them proof of identity to request a PUK code. Use the provided PUK code to unlock the SIM.

Depending on where you buy it, your Android phone may be unlocked and can support SIM cards from any carrier, or it could be carrier-locked and require specific SIM cards. While it’s not always ...

You can check if your phone is unlocked using your device's network settings, trying a SIM card from a different carrier, or speaking with your mobile carrier directly. Generally, phones purchased ...

There are often very specific rules that you have to follow before you can unlock a phone. For example, the phone can't be ...

You may find that you need to check the cellular service carrier of your iPhone, especially if you are planning to follow carrier requirements to unlock ... doesn't have a SIM card, you won ...

It's a necessary step in changing carriers that you might not even know about until you insert that shiny new SIM card into your iPhone ... then it's likely already unlocked, but if you've ...

If the contract period is over, the phone may be unlocked by entering a code from the carrier. Apple's iPhone ... a recipe for marketing failure. See SIM card and iPhone jailbreaking.

After that period, the lock is removed and you are able to insert a new SIM card and change your wireless carrier. How to unlock a Verizon phone you purchased from a retailer If you purchased the ...