How can a lock from one service provider be removed from the cell phone,checked with rogers they told $200 charges. Any cheap alternative available..?
I was looking for a phone from US which may not be unlocked.

Check at any small cellular/electronic shop owned by our desis or grab any one of our south asian newspapers and look for any electronic/cellular shop contact nos.They should be able to unlock the phone in 20-25 $.

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I was looking for a phone from US which may not be unlocked
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I would advice you to first check with US phone company for your model and ask them how to unlock your phone.They will provide you a process to unlock and that is free(I presume your phone is GSM).
Before I moved from US I called up Samsung(My model is S105) and they explained me the process of unlock and then in Tornoto I visited Rogers outlet they took out my T Mobile SIM card and inserted Rogers one and I paid only $25 for the new SIM card....that's it

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ani