If i read your comment correctly you dont want to change your primary number and the other 9 lines right?

If that is the case, and you need a gsm phone, im guessing because you cant get reception on sprint phones? Any way, you can always port your main number to a GSM Carrier like Cingular. In regards to your other lines, i believe they can do that also, but you may want to ask a rep. All you need to port the number is your current cell phone provider's account number. Then the cingular rep will take it from there.