I've currently have a GSM phone on a voice-only plan from a local company. The n900 is really looking sweet, so I thought I might just by one and stick my SIM card in it and use it as a phone + WiFi internet tablet. This should work out pretty well sense I spend most of my time with WiFi coverage.

Can anyone think of any gotchas with that plan? The fact that I have voice service but no (mobile) data shouldn't be a problem right? What about the assisted GPS? Am I going to wait 5 minutes for an initial fix or does it use cell tower data that is available with voice-only service? Will the mapping/navigating work with no data connection (ie have at least the local maps cached via wifi)?

Any thoughts are welcome.