"No Service" after changing my SIM Card
I have an iPhone 3G with 2.2 firmware, and it was working fine since i had bought it, i never removed my sim card from it since i had bought it, today i removed my sim card to put it in another phone then i put it back to my iphone but now it tells me there is no service and i can't make or receive any calls and when i remove SIM card while the phone is Powered on, it tells me "no SIM card inserted" and when i put it back still no service.
Please Helpppppp
Please Helpppppp
iPhoce 3G 2.2 8GB, Windows Vista