If I wind up getting the X tomorrow (very likely) I will be switching from Sprint to ATT. I'm thinking about going to the store to check them out and picking up the personal pin or whatever it's called to take home and put in my Moto Maker design. My question, being a new customer, is this: will I be without a phone for 4 days? If they have to transfer my number to the new phone, am I just dead in the water while I wait for delivery or does the switch not take place until I activate the phone?