Like Jobs and others have said, buy a bumper or case... Don't buy the bumper though seriously, get a cheap case online. I got mine on www.meritline.com for around $3. It pretty much alleviates the problem, although AT&T is always going to have sporadic service.
Also, apparently people have put scotch tape over the antennas also, heard this works.
Also, apparently people have put scotch tape over the antennas also, heard this works.