Currently Being ModeratedApr 19, 2013 6:41 AM (in response to LaminDibba)
Please make sure that you are using a micro sim card.If you are using a micro sim card then please make sure to insert the sim card in the correct manner.If the problem still persists then it is likely that youre sim has been damaged.If damagd please buy another micro sim.
Hope this solved your problem
Currently Being ModeratedApr 19, 2013 6:48 AM (in response to LaminDibba)
Did it work before you put the SIM in? Is the SIM the right one for the carrier the phone is locked to? Did you do anything just before the problem appeared, such as updating iOS?