T-Mobile has grown its customer base by 10.3% in the past year and now claims a total worldwide count of 119.6 million subscribers. Deutsche Telekom – T-Mobile’s parent – released key performance indicators today ahead of its fourth-quarter earnings report due next month. An Unstrung report today highlights how the biggest contributor to T-Mobile’s growth in 2007 was its US division. T-Mobile USA had 28.7 million customers at the end of last year, an increase of 14.6% compared to the end of 2006.

T-Mobile attributes its overall growth to the popularity of new products such as MyFaves, the iPhone and new tariffs. As reported yesterday by Mobile Business Briefing, in Germany T-Mobile has sold 70,000 iPhones with T-Mobile contracts. MyFaves now has over 5.1 million customers in Germany and the US. Meanwhile Unstrung reports that T-Mobile’s acquisition of Orange Netherlands also contributed to the subscriber growth, accounting for 2.2 million of the operator’s total subscribers. In the UK, T-Mobile recorded 406,000 net additions, bringing the total number of customers to 17.3 million. The operator also said 3.2 million subscribers in Europe are using its Web’n’walk service.