a roaming agreement with Vodafone NZ, and as such, their customers roam only on the network when they have no coverage, otherwise they connect to 2degrees' own equipment. Phone numbers In New Zealand all mobile phone numbers start with 02. Vodafone is allocated the 021 prefix with other networks being allocated other prefixes – such as 022 to 2degrees, and 027 to Spark. However Number portability was introduced to the New Zealand market on 2 April 2007 which means that customers can bring, for example, their 021 prefixed number to Spark or 2degrees. Within New Zealand, the network is sometimes referred to in speech by its prefix—i.e. 'Are you 021?' instead of 'Are you with Vodafone?'. 029 Prefix Vodafone used to operate the 029 prefix on behalf of TelstraClear, in addition to its own 021 prefix. TelstraClear customers, mostly corporates, used to be able to get mobile numbers under this prefix; these customers were billed by TelstraClear instead of being billed directly by Vodafone. In 2007 this agreement lapsed, and in 2008 some of these customers were transitioned to Telecom who serviced them initially with CDMA2000 technology. Those TelstraClear 029 customers not transitioned to Telecom New Zealand remained with Vodafone. Subsequently, TelstraClear joined Telecom as a MVNO operator, but that relationship soured and TelstraClear re-signed with Vodafone in 2009 and remains on the Vodafone network. Comparison with 027 Prefix Spark NZ (formerly Telecom New Zealand), Vodafone's rival, has fixed 10-digit numbers under its 0272-0279 prefix, which allows approximately 7 million possible numbers. Telecom originally had mixed 9-digits and 10-digits number using the older 025 prefix. The 027 prefix with only 10-digit numbers simplified its numbering system at the time of launching its CDMA network. The older 025 prefix was phased out with its now redundant AMPS and TDMA networks. 3G services On Wednesday 10 August 2005 Vodafone introduced a new 3G network employing the UMTS technology widely used in Europe and elsewhere. Using this standard, Vodafone now offers Video Calling, music downloads, SKY mobile TV and other services from its Vodafone live! portal. Vodafone began rolling out HSPA+ data services on its UMTS network in 2011; at the time of writing (May 2012), Auckland, Wellington and Christchurch have coverage. HSPA+ is capable of a theoretical maximum 168 Mbit/s download speed and 22 Mbit/s upload speed, although higher speeds are only supported in areas with an excellent radio signal. Vodafone launched