CdTDroiD: So i found this video of a guy putting a little bit of scotch tape on the back of his sim card then putting it back into the iPhone and dramatically improving signal, well i gave it ago and i must say im very surprised, in my office at home i can normally get 1 bar if im lucky now i have 3 or 4... really weird i guess it just needs a little more pressure on the contacts.

It also improved my 3G download and upload speeds buy about 40%.

If you try it remember your responsible not me lol.