In and around SLO coverage is usually ok, but terrible in the one place I need it most. I'm a Cal Poly student and coverage on-campus is spotty at best. There are very few places on campus that I can send or recieve calls. Coverage gets better when I go into town but it's still not great. Wouldnt recomend T-Mobile if you're going to be spending a lot of time in San Luis.

On all my phones for the last 10 years I've had very good reception from AT&T / Cingluar. I take my phones to all the places people complain about, and I almost always get fine reception.

I haven't been dropped in SLO. (Oddly, my bedroom is the one place I have fewer reception bars.) Traveling north and south is fine too, except one spot between SLO and King City called San Ardo. It only drops for a second if you're on the 101. There's one spot by hills too that sometimes drops. I do that route a lot. Otherwise good. The best place to go if you have problems is the main office on Mill. They're still fake and sneaky and make you wait, but can do more for you there if they mess up. Keep all receipts of any changes you make to your plan.

T-Mobile has worked well for me. They have provided good support for my Sim card based phones from europe. Overall I am very satisfied... .

Constantly dropping calls.

Got phones in November, still having billing issues with Cingular, they have been overbilling me by hundreds of dollars each month and keep giving me the same old line: "the problem will be fixed by next month". I often do not get phone calls in Santa Maria, and if I am at home I have to go outside to make phone calls.

Absolutely no signal on Tonini but if you cross Los Osos Valley road the signal picks up again. I was told by the CSR to move if I wanted to get a signal at the apartments :-(

The reception here in San Luis Obispo, is good. However, if you head north or south on the 101 the reception starts to drop in and out.

No signal. Cannot make calls and get calls. Had to walk for 1/4 mile to make any calls.

As others have said, ATT TDMA does not provides a reliable signal in this region. I left their service Nov. 2003. Signal strength typically read 1 bar except for every now and then when I would notice full strength for half an hour or so. I will never go back to ATT as their CSR's advice was to try to use my phone when it did read full strength rather than some promise to fix the problem or being told the problem was not repairable. I am confident their support knows nothing of what is going on and after complaining mutliple times along with the other ATT users in SLO I was told that no one else was reporting the problem.