How do I increase signal strength on my T-Mobile iPhone?

[lambo]

Hi, my iPhone gets amazing signal strength in some areas and horrible signal in other areas. Whenever my friends are with me though, their regular phones get great signal, while mine doesn't - even though we are all using T-Mobile.

I've tried putting the phone into airplane mode and then turning it off again, but it doesn't help. I also saw that Griffin made a case that increases signal strength, but it only works with AT&T because of the specific frequencies of each service provider.

Is there some way I could increase the strength?

[jlake02]

99.5% of users have AT&T so you are probably on your own to figure this out.

[fireshot91]

When you're with your friends- Do they also have iPhones?
the iPhone sucks at getting signal-AT&T or T-Mobile.

[rotobadger]

I'm assuming you have a Jailbroken iPhone? What firmware are you on? Your issue could have something to do with your baseband if you are on 1.1.4.

[lambo]

I'm running 2.1 firmware on the original iPhone and it is jailbroken.