My iphone was jailbroken and unlocked. I was using with T-mobile for like 3 weeks. It was working perfect then all of a sudden last week my wireless of my house was not detected by my iphone. other Laptops in that networking are working fine.
I tried resetting, I updated my software to 2.2. I have not unlocked or jailbroke after that. But still wifi should work right?? but it dectects wifi for like 20 seconds but after i open safari... wifi just dissappears.

I don't know.. its a brand new iphone.. should not be a hardware issue. Or may be my router is not compatible with iphone. I have a 2004 netgear router.