I've also got a Nokia 7650, and was planning on 'upgrading' to the P800.

So I gather you advise against this?
Mind you, if putting it in your pocket and sitting down is enough to damage it I don't even want it anymore. It's not like I will be throwing the phone, but knowing myself it should be able to withstand a few "sudden drops".
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup