It shows Sim Error or else Invalid Sim...Or even though Sim Inserted it asks "Insert Sim"
If it says anyone of the error like that means Your Mobile is Locked To Network ..You need T Unlock it to insert other Network Sim GSM Sim Card....
It may locked to some Network....You can get the code here
http://www.superunlockcodes.com/supported-phones/rs12wp7/ and Unlock the Mobile from the Network Lock....
I hope..You got solution...
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