Why am I unable to activate my iPhone my iPhone?

[iMore Question]

hi! I am not able to activate my iphone a 1303 using wifi or itunes.It says that you There is no SIM card installed in the iPhone you are attempting to activate.
Please disconnect and insert a SIM card in the iPhone.
on itunes while i have already inserted a working sim card

 

[kch50428]

Re: activating problem on IPhone a1303

Try turning the phone off, removing the sim... and then reinsert the sim, and turn on again.

 

[Just_Me_D]

Re: activating problem on IPhone a1303

Your device may be locked to a certain carrier, and any SIM not associated with that carrier will give you similar errors.