Clark has had many callers who want to switch cell phone carriers but are upset over the fact that they have to buy a new phone. Well, the good news gets even better. Three of the nation’s six cell phone providers are using the same phone technology, so you may not have to buy a new phone. The three companies – AT&T, Cingular and T-Mobile – are all using GSM (Global System Mobile) or are converting to GSM. Some customers who have been with Cingular or AT&T for a while will not be able to do this. But if you have a GSM phone, you will be able to take your new phone with you to a new provider. T-Mobile even gives you an “unlock code” after three months, so you can take your phone with you. It also means that if you travel a lot overseas, you can simply buy a chip, put it in a phone and use it overseas. AT&T, however, refuses to give the unlock codes out. But Clark has found a way around it. There are several Web sites out there that will walk you through the steps of reprogramming your phone. One of the sites, thetravelinsider.info, charges $5 to help you with the process. If you switch to Sprint, Nextel or Verizon, you cannot take your phone with you! These three all use a different technology, so it won't work.