Cell Phones iPhone — 15 February 2008
According to iPhoneatlas, an improperly seated SIM card can impact iPhone signal strength. Ejecting and then re-seating the SIM can sometimes resolve the issue. If that doesn’t work – try the following at your own risk – placing a piece of scotch tape on the outer side of the SIM card holder increases the pressure on the SIM card contacts and thus improving signal strength.
Check out iPhoneatlas’ other tips for improving iPhone strength.
Via Wired

iPhone 4S vs HTC Rezound (comparison)
Screen lag on the Rezound? What are you talking about? I'm sitting
iPhone 4S vs HTC Rezound (comparison)
Josh 14MB/s is awesome. When Web Traffic is low the Rezound get's 27
iPod Touch vs. Sony Walkman Z (comparison)
you seem to forget to mention the most important reason for buying the
How to Create iPhone Setting Home Screen Shortcuts (how to)
Hi same issue as JC - Version 4.3.3 (8J2). Icon fires up Safari which
10 Streaming Porn Sites for the iPad (list)
Hands down....it's like the Walmart of the porn world.