I upgrade my iPhone 3gs from 4.1 to 6.1 but i am unable to activate my phone now

I upgrade my apple iPhone 3GS IOS from 4.1 to 6.1.4 but now i m unable to activate this phone, and there is no sim card is accepting by this phone.
please help me to solve this issue as soon as possible

Sounds like your iPhone was unofficially unlocked by hacking it. You need to call AppleCare, tell them you only want to know which cell carrier your iPhone is locked to and give them the model and serial number. Then contact that cell carrier and see what their official unlock policy is and if you qualify.

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