Yes, I have a similar problem. I have a thread here:
Basically, if I run a sense rom (I have only tested Viper) or a CM11 rom (I tested the 6/25 nightly, Gummy Rom works too) then my network seems to work fine and I don't get the SIM locked error. If I run a more AOSP based ROM then I get this issue.
Test a sense ROM to see if you still have this issue, if so, you could need to get a new phone.
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