How do you know you dont have it? Have you measured the signal itself using a signal meter? The point is the bars wont tell you.
Screw the bars, I just care whether or not I can still get voice and data. Fact is, no matter how I hold my iPhone I never have problems with either. So what if I lose a bit of signal strength? If the call stays connected and everyone can hear each other clear, it's no different from any other cellphone I've owned. My blackberry (work phone -- company is still on BES exclusively) drops signal routinely in my own office building. Talk about a crappy phone.