Motorola RAZR V3xx

Need help with phone number storage location. It's been so long since I bought the phone, I forget which is the default location - phone or sim card. I believe the sim card assignment storage location allows more info to be stored per contact. Is that correct? If so, I'd like to dump everything in my phone storage location, change the assigned storage location default to sim (not sure how to do that), then restore all my currently backed up info from Phone Tools on to the sim card, (any reason not to do this?). Can anyone help with some pointers how best to accomplish that?