Contact the provider over the phone if you cannot find one or visit a local store for assistance. Log into your online account and check for a PUK code option. However, there is a brand of 3G devices that do require a special code. The SIM card unlock process is roughly the same for other providers such as MetroPCS, Cricket Wireless, Virgin Mobile etc. There are two preset codes that you can use to unlock them either 000000 or 123456. If you are no longer a Sprint customer but have paid off your device, unlock your SIM card by calling Sprint's support number or going to a local Sprint store. To get the PUK code for your Sprint phone online log into your Sprint account and click “Get My PIN1/PUK1 Unlock Code." Open the "Phone" app on your device to access the dialer, and then type in your PUK code. Sprint offers SIM card unlock services both online and via its 88 number. Visit your local AT&T store to get the SIM card unlocked as an alternative to using the online process. There are two PINs and two PUKs (PIN1, PUK1. If your device is not currently displaying “Enter PUK,” press “* 05” and then type in the PUK code. If you backed out of the PUK code screen, you could go back to it by going to Settings Mobile Data and enter the PUK code you received from the network operator. Its a phone unlock code specific to each individual SIM card, it is used in case when a 4-digit PIN is forgotten. Click “Get Your PIN Unlock Key (PUK).” Launch the "Phone" app on your device, type this PUK number into your locked SIM card Android or iPhone device and then tap “OK/Yes” to unlock the SIM card. Log into your AT&T wireless account and navigate to “My Wireless” followed by “My Devices & Features” and then click on the SIM card locked device. The process to unlock an AT&T SIM card is similar to Verizon’s.
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