Running a sidekick without a data plan is a real pain in the ass.
You have to be very careful about always saving new contacts to your
sim card and then importing them into your phone book. If the battery on the phone ever dies... everything in memory is wiped out, all your text messages all your contacts, everything. So make sure that you save it all to the
sim card if you want to be able to restore it.
Apart from how awesome the keyboard is, the phone is really pretty terrible. They did a pretty good job of designing the phone so that it would be a total failure without the data plan. My advice would be to just try and find a Blackberry curve.