Motorola initially held off producing WiMax phones -- touted as faster than current devices -- as top U.S. services Verizon Wireless and AT&T Inc
But Motorola has recently pushed heavily to win new operator customers after Verizon Wireless started selling the Apple Inc
Sprint, the No. 3 U.S. mobile provider, is also aiming to distinguish itself with advanced devices as it faces tough competition from bigger and smaller rivals.
(Reporting by Sinead Carew; editing by John Wallace)
(This story was corrected in the first paragraph to remove mention of Triumph, which is not a WiMax phone)