Right now I have 2 Pres on the 129.99 1500 family plan and 1 phone on a $30 SERO plan. The SERO plan is the phone my mom uses, let's call that line 8128. She only uses voice and can barely read a text message that I'll send to her. But, the SERO contract is up and it'd save me $10 a month to switch the line to the family plan. I want the EVO and would like to use the 8128 line for the upgrade. Is it possible to add the phone to my current plan, without a contract? I can see them giving me trouble. Then in June, get the EVO at Best Buy and just swap ESNs when I get home. This would be the easiest, but I doubt Sprint will just add 8128 to my plan without a contract. Or should I just go to Best Buy in June, buy the EVO. Activate a new number on it, pay the 199.99. Switch ESNs. Then "port" the 8128 number from SERO to the new line? Not really sure if one can port a number from one plan to another on the same carrier. My end goal is to add my mom's number to a phone line on my family plan, cancel SERO, and get the EVO. I cannot stand the Pre hardware anymore and would rather not wait till October 1 when my upgrade comes. FYI, I'm afraid to get the EVO at a Sprint store or online because when I switch the EVO from 8128 to my line...it will definitely cause me to lose the mail in rebate.