Broadband provider O2 has signed a three-year contract with Nokia Siemens, which will see the modernisation of its 3G network.
Nokia will now provide around two-thirds of O2 mobile broadband coverage in the UK, accounting for its 3G services in the south of England.
The deal also covers services including network implementation, project management, advanced technical support and consultancy services.
Rob Stent, Nokia Siemens Head of Customer Team for O2, said the firm was committed to providing its radio equipment to power O2's "great network".
He claimed Nokia would be increasing coverage and capacity for the internet service provider, using its "market leading" Flexi Multiradio Base Station.
"The hardware being delivered now, as well as providing O2 customers with faster data rates and better connectivity, will also allow support for future long-term evolution (LTE) services with a simple software upgrade," Mr Stent added.
Ofcom said last year that LTE mobile broadband services could be introduced in the UK by 2014, once regulatory issues have been addressed.