iphone 3gs gray wifi and "searching" or "no service"

[jad3rad3]

I have an iphone 3gs. The wifi option under settings is tinted gray. I have rest network settings. I have soft rebooted it. I have restored to factory settings. I have even jailbroken it. NOTHING. Its super flustrating. I have even dryed it thinking possible water damage. Is there anything I can do?? Anything that may work would be appreciated. Also in the town I live in has good att service. In fact my sister has an iphone with the with the same service and gets signal while I don't until I leave the city. I don't know if the two are connected. Ive called att and apple support. No use. I just need something that will work or has potential to work. At this point ill try anything. Thanks in advance.