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Enter the open code you got from When you turn on the SIM PIN lock, the device prompts you Choose your device on the Devices page, then click the Security drop-down to find Mobile Device Unlock steps. Once the phone is turned on, it prompts for ‘SIM network unlock PIN’ or the unlock code or the subsidy password. SIM network unlock PIN Go to solution.You can go to a fido store and politely ask them to try a fido chip they should have no issue checking. 1 – Switch ON mobile with a not Allowed SIM Card, 2 – If phone ask, enter the PIN code of your SIM Card. But if you have purchased your phone on contract basis then you may need to pay termination fee to break the contract of you want to unlock the device before the contract term expires. It will request that you enter "SIM Network Unlock PIN". Network Lock If you originally received your device from one network provider and your new SIM card is from a different network, the original network provider may have locked the device to their network. In some other cases, the mobile will show a message that says "Insert valid SIM card" and prompt for a code. If you can't unlock your SIM card using the SIM PIN or PUK code or if an alert says, "PUK exhausted," ask for a new SIM card. Next, remove the SIM card you originally have. Sim network unlock pin 3 ‘Please enter your network unlock code’ ‘Enter SIM network unlock PIN’ You'll want to make sure your phone’s unlocked before you activate your SIM, or you’ll start being charged for your plan but you won’t be able to use calls and texts.