Need help on a carrier update

[MustangLife]

I posted a question in the regular iphone forum asking what AT&T carrier setting version was most recent. I have version 7.0. I'm jailbroken as you can see. I don't know anything about carrier settings and what not. But I do know inside my house i just moved to a few months back I'm getting a weak weak signal 3g or edge but if i walk down my street 100 yards I can gain like 3 to 4 bars of 3g.

Any help on this would be appreciated

Thanks
Josh