If you're with Cingular or AT&T; your phone comes activated which means that when you have your number ported your original activated number gets canceled which voids your warranty. The website only says that they haven't worked out a procedure with Cingular and to contact Cingular. No mention of their dealer code cancellation if number ported. Some people are going to be in for a very big surprise when they don't get the rebate. Because I had my number ported which I needed I am stuck and Amazon will not work with me on this. It's a shame because up until now I have been very satisfied using Amazon. Now I feel like I've been taken for a lousy $100.As far as the V551 phone... it's great and I'm really happy using the bluetooth Motorola HS 820 headset while driving. Voice dialing, clarity and everything else is fine so I don't understand some of the negative reviews below. It's an earpiece not a telephone and everyone hears me fine.Mobile PhoneTools also works fine with desktop using Linksys adapter and the V551. It does everything it's supposed to do so again I don't understand negative reviews. I'm using XP and a 1.8 processor with 512 MB memory.