T-Mobile sims remain fully supported by EE, who are ultimately owned by BT since they acquired the company in January 2016 for £12.5 billion.

During this time One2One used a high-profile TV campaign featuring celebrities such as Ian Wright,[9] Kate Moss and John McCarthy.

Prior to this T-Mobile had a contract option known as 'Flext' which gave the user an amount of money to use for calls, texts, MMS and mobile internet as necessary.

On 12 December 2007, it was confirmed that a merger of the high-speed 3G and HSDPA networks operated by T-Mobile UK and 3 was to take place starting January 2008.

[14] The British Office of Fair Trading joined this call by asking the EU to allow it to investigate the proposed deal in February 2010, saying that it believed the merger could have a 'significant' effect on competition.

[15] On 1 March 2010 the European Commission approved the merger, on the condition that the combined company sell 25% of the spectrum it owns on the 1800 MHz radio band and amend a network sharing agreement with smaller rival 3.

[17] On 11 May 2010 it was announced that both the Orange and T-Mobile brands would remain on British high streets, although their new merged parent company will be called EE.

T-Mobile says: "Browsing means looking at websites and checking email, but not watching videos, downloading files or playing games.

[22] The mobile operator admitted that one of their own employees is facing prosecution after selling personal details of thousands of British customers to rival companies in a major breach of UK data protection laws.

[22] UK Information Commissioner Christopher Graham said the data was sold for “substantial amounts of money” to brokers working for other mobile phone companies.