Anyone with advice on buying a Motorola unlocked cell phone?

My husband dropped his cell buzz in some water and has no insurance, not due for an upgrade for a even as. Most Motorola phones we have found are unlocked. Cingular says some of the features may not work on unlocked phones. Is this right? Has anyone else used unlocked phones with Cingular?

He is looking at the razr, pebl (sp?) or something like that with camera & video.

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