iphone 4 no signal

[kevinnguyen]

my iphone 4 have no signal at all even if i put my at-t sim card in still get no bar at all ,is any one no what is the problem ,can u tell me how to do it

[Tazz229]

Is it jailbroken and unlocked? Have you updated to 4.2?

[dennisls111]

update it .

[kevinnguyen]

no just restore 4.1 jailbreak but not unlock,after i restore, on the phone just said emergency call only even if i put my real at&t sim card in still does'nt work but if i use the limera1n to jealbreak it then the phone start normal but no signal at all