O2 switches on the service in London, Leeds and Bradford and will roll out to a further 13 cities before the end of the year.
O2 have today launched their 4G network in the UK. It comes shortly after EE launched its own 4G service last October.
The former has begun roll-out in London, Leeds and Bradford, reaching up to five million people. A further 10 cities will follow before the end of the year – Birmingham, Newcastle, Glasgow, Liverpool, Nottingham, Leicester, Coventry, Sheffield, Manchester and Edinburgh. The operator is planning to make 4G available to an additional two million people per month.