I just bought a plan, and inserted the SIM card. The phone is NOT locked according to Virgin (old provider). I'm prompted to "Enter Network Lock Control Key" to Unlock. IN the meantime, I'm not connected to the network. Is public mobile supposed to provide me with that Network Lock control key? I tried 1234 and 0000 and now I'm down to 8 tries left.
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This is asking for carrier unlock code. Sometimes the carrier thought it was already unlocked but it could be other reason it got locked again. (e.g Samsung phone was originally unlocked but it will lock to the first SIM inserted )
So, call them back and they should be gladly provide you the unlock code