Yesterday I took a trip down to Phoenix from Bullhead City. I took both my phones with me, a 6620/Cingular & V600 flexed/flashed/T-Mobile to be exact. We started off east on SR-68 to Kingman. Coverage was identical of course, since Cingular & T-Mobile share the same network throughout Mohave County. Their were a few weak/dead spots going up the pass headed to Golden Valley, but nothing to be concerned with. Once over the pass coverage was great all throughout Golden Valley (-75 to -85 dB). Heading into Kingman their is another small pass you go through, but the coverage was great going through this pass. Just before we travel through Kingman we hopped on I-40 continuing east. Coverage on I-40 through Kingman was very good, with simular dB readings as in Golden Valley. Once we left Kingman, we had continued Cingular/T-Mobile coverage for about 10 miles to the east of Kingman. Both phones then picked up AT&T, which was strong all the way to Hwy 93. We then took 93 south headed toward Phoenix. Both phones continued to pick up a good AT&T signal for about the next 10 miles on 93. Once the AT&T signal faded out my Cingular/6620 switched to CellOne (Dobson), and my V600/T-Mobile went to "emergency only". My 6620 continued to have good signal with CellOne untill about 10 to 15 miles south of Wickieup. From that point to about a few miles north of SR-71 coverage dropped drasticly. Their were a couple of major holes, if their was any signal it was very weak (High -90 dB). The V60/T-Mobile phone on this part of the trip was either "No Service" or "Emergency Only". There was a point were my V600/T-Mobile pick up a faint AT&T signal for less then a minute, where my 6620/Cingular showed "No Service". Approaching SR-71 Both phone picked up on a good T-Mobile signal. Between SR-71 & Wickenburg coverage was pretty good with T-Mobile, their were a couple of very small dead spots. Reminded me of the coverage through the pass going to Golden Valley. Coverage was very good in Wickenburg, as we stopped to have a bite to eat. Continuing south (Hwy 93 turning into Hwy 60), T- Mobile had great coverage all the way to Phoenix with my V600. The Cingular/6620 Had the same coverage untill we were just out side of Sun City. The phone then switched to AT&T from then on, and throughout the Phoenix Area. Coverage in Phoenix was very good with both providers. My V600/T-Mobile never went below 3 bars, and The 6620/Cingular had full AT&T signal (never went under 5 bars). I did place one call on my V600/T-Mobile phone leaving Phoenix (Sun City). The call was strong & very clear for the most part. A few times it did distort, but over all it was very acceptable. I would of liked to have made a call on my 6620/Cingular, but the battery was about to die. Running CellTrack for 4 plus hours will do that. The only thing that surprised me was the lack of good coverage in many spots on hwy 93 from CellOne (Dobson) in Mohave Co. This road is very well traveled, and the roaming revenue I would think would more then make up for the cost of improving the coverage. If they don't do anything about that. I would bet once Cingular buys out AT&T they would seriously look into covering the Hwy. Also if someone can confirm that T-Mobile cripples the 850 band on their phones, or are they just not letting customers roam on providers with 850. I would think with all the E911 stuff being passed, that blocking the band on a phone would be against the E911 rules. My flashed/flexed V600 said "Emergency Only" quite often. IMHO it would be wrong to bar a phone that could make that emergency call if needed. Well, that's it!