Yes, it's a "Universal Unlocked" mobile phone. That means it will work on all U.S. based cell phone service networks. This is a special cell phone that has the ability to use both CDMA and GSM technology (only one at the same time). 99% of all cell phones that you buy use either CDMA OR GSM technology; this phone can use either one, that's the great thing about this phone. You can take it with you if you change carriers! Here is a partial list of carriers and which technology they use.
GSM: AT&T, T-Mobile, Tracfone, Consumer Cellular.
CDMA: Verizon, Metro PCS, Sprint, U.S. Cellular, and Tracfone.