I currently have a nextel plan but my plan is ending in about 3 months. I am switching to t-mobile but I can't keep my number so is there a way that I can switch from Nextel to Boost when my plan ends but switch my number and walkie number to the Boost sim card? Thanks
But Boost isn't really a service its prepaid. Will I still be able to keep my number?

you can keep your number no matter what service you go to.