Yes if the phone is unlocked. Phones are locked by Nextel & Boost so you cant swap the sim cards out. here's one website that does it http://www.unlocktotalk.com/Nextel.htm Before you pay ask Nextel or Boost to unlock the phones they might do it. You can also buy phones that are already unlocked just search amazon.com or other retail sites. Check out this mobile phone blog for many links and articles http://danmobile.blogspot.com/