The owner of Orange and T-Mobile confirms plans to offer the UK's first super-fast mobile broadband service before Christmas.
Britain's largest mobile operator, Everything Everywhere, will also rename itself EE as part of the launch - as revealed by Sky News last month .
The company won approval to introduce 4G (fourth generation) services - which offer speeds up to five times faster than 3G - ahead of its rivals.
It said it plans to make the state-of-the-art technology available to around 20 million people in 16 cities across the UK in "the coming weeks".
The service will be available on HTC, Samsung, Nokia and Huawei devices, the company said - and EE is also widely expected to offer it with Apple's new iPhone 5, although this is not confirmed.
The EE brand will be launched in a few weeks, the company said, adding that its Orange and T-Mobile brands "will continue to thrive".
The operator hopes its new brand - which will replace the Orange and T-Mobile signage on its 700 UK shops - will boost its position in the highly competitive mobile market.
It has already said it will invest £1.5bn in its network over the next three years, and plans to make 4G available to 98% of the UK's population by the end of 2014.
The announcement is likely to anger rivals Vodafone, O2 and 3, who have to wait until additional access to the 4G spectrum - airwaves that carry mobile signals - is auctioned by the Government next year.