I have Cingular and am very happy with them - much better than expected. I get coverage even when Verizon sometimes doesn't in my area (north of Boston). I tried Sprint and ATT but didn't like them near as much as Cingular. I also used to have Nextel and they were just fine, but they didn't have a bluetooth phone that would work with my X. That's when I switched. They may have them now - haven't checked lately.

Dosn't Nextel's i605 pair with the X5?

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The coverage is obviously dependent on your location. Even that can change, depending on the addition of towers as time goes on.

I have had Alltel for several years, and have been very pleased with them. They don't cripple the Bluetooth capabilities on their phones, like Verizon does. I have a Motorola V710 that works very well.

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Your best selection of Bluetooth phones will be with the GSM carriers, which is Cingluar and T-Mobile. In my opinion, you will get the best overall GSM coverage with Cingular, although your mileage may vary depending on the specific area that you typically travel in.

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I have two phones, one on Verizon one on Cingular, the Cingular one has FAR better coverage then the Verizon.

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My buddy has Alltell with a MOTO V710 and loves it. I paired it to my BT last night. I don't think the phonebook transferred though. I will have to look again. I used his as a test while I decide on a new cell phone.