UK 4G speeds are more than twice as fast as 3G, according to a new report from watchdog Ofcom.
They clocked up an average of 15.1Mbps (megabits per second) while 3G averaged 6.1Mbps, it suggested.
The report looked at the speed and coverage of mobile networks in five major UK cities - London, Birmingham, Manchester, Glasgow and Edinburgh.
It indicated that London had the fastest 4G web browsing speeds but the slowest 3G browsing speeds.
While it took just 0.72 seconds to load a standard web page on the 4G network in London, it took 1.2 seconds via 3G.
Getting a web page to load on the 4G network took the longest in Glasgow (0.82 seconds) while Manchester had the best 3G browsing speeds (1.01 seconds), according to the report.
Edinburgh recorded the highest download speeds for both 4G and 3G with London having the lowest for both.