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Try using different SIM cards, the sim card may be defective or unregistered. If it can find a network using a different card, your SIM is no longer registering with the network correctly. Replace that SIM.
The other possibility would be a defective antenna. Replacement antennas are available online.
Phone is not receiving any radio signal / received signal is too weak: Confirm that network coverage is available where you are by contacting your service provider.
SIM card is not working properly:
Insert your SIM card into another phone Note: Contact your service provider if you get the same message again. Phone is not working properly: Insert your SIM card into another phone. If the second phone works with the inserted SIM card, then the problem is probably with the first instrument. Note: In this case, contact your nearest Sony Ericsson service center regarding your phone problem.
Thanks for using FixYa. Please check the sim card first because it might not be making good contact to the prongs. It's not the phone causing the ‘no network coverage’ issue, it's either the sim needs to be removed and wiped off with a soft cotton material and then reinserted or it's the network having problems itself. Also try the sim card in another phone. If it works, then the problem is with the handset. If the sim doesn't work in another handset then contact your network provider to get the sim replaced. If it is still under warranty you'll need to take it back where you purchased it from to get it repaired or replaced. Please do accept the solution if the issue is resolved or else revert for further assistance. Thanks Rylee
well... seem like you phone has got locked from the network may be accidently in case of stolen better check you service provider and if they say every thing is fine try to flash your mobile .it has some perticular number to flash it try these number *#7780# (password 12345)