Before even trying to unlock your network-locked smartphone, you would have to wait a period of 12 months from the date of purchase. So you’ve found the phone of your dreams at the price you budgeted ...

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

If you have a SIM card PIN enabled on your phone to access data on the SIM card, but you repeatedly enter it incorrectly, the SIM card may lock you out from further attempts. You can reset the SIM ...

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish ...

If you own an iPhone 4 on AT&T, using the device while traveling internationally means paying sky-high roaming fees, jailbreaking or limiting data use to when you're on a WiFi network, either with a ...