How do I Check if the phone is UNLOCKED ??
I have one Nokia 6600 from Tmobile. I had unlocked(or atleast I think so) long back. I tried putting my friend's Cingular SIM card today and got message "Not Valid SIM".
What can be wrong with this ? Do I need to try to UNLOCK one more time ?
Please help...
=ShyGuyCalif
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