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. The SIM card unlock process is roughly the same for other providers such as MetroPCS, Cricket Wireless, Virgin Mobile etc. 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. Verizon displays your default PIN and PUK for your device in a pop-up window. Your SIM card becomes blocked after the incorrect PIN number is entered multiple times on your phone. If your device is not currently displaying “Enter PUK,” press “* 05” and then type in the PUK code. SIM cards can be configured to use a PIN number that protects data on the SIM card from being accessed by others. 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. The default SIM unlock code for T-Mobile and Sprint is 1234, while the default unlock code for Verizon and AT&T is 1111.
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