Telecom Mobile is New Zealand's second-largest mobile operator by market-share, slightly behind Vodafone. Telecom primary mobile network is called "XT", and operates at 850 MHz nationwide (with some 2100 MHz overlay in urban areas), and delivers 3G data connectivity wherever there is coverage.
Telecom originally operated a TDMA (AMPS, Digital D-AMPS/TDMA) mobile network; this was superseded by its CDMA network. The TDMA network was turned off on 31 March 2007, and most of its customers migrated to CDMA. The CDMA EV-DO network was marketed as T3G, a 2 MB third-generation mobile system. Telecom announced on 8 June 2007 the intention to build a W-CDMA/UMTS network, to be called XT Mobile Network, based on WCDMA HSPA technology, to replace its current CDMA EV-DO network. The network was launched on 29 May 2009. The specifications of XT were chosen to bring it into line with a number of other networks in overseas territories, such as Telstra's Next G (in Australia); furthermore, 850 MHz services can cover greater geographic distances and penetrate buildings more effectively than higher frequencies. The CDMA network ran in parallel with XT until it was shut down on 31 July 2012. The TDMA network used the 025 mobile prefix; this was changed to 027 with CDMA, and 027 has continued with XT.
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