AT&T Wireless, T-Mobile, Cingular Wireless, Nextel, Sprint, & Verizon Wireless. (8 carriers in all!) Koolphone is the leader in free wireless phones. Our phones are the best cell phones on the market: Nokia, Motorola, Samsung, Sony Ericsson, LG Electronics, Sanyo, Handspring, Kyocera, NEC, Siemens, and more.