LONDON (Reuters) - Ride service Uber [UBER.UL], which enables users to instantly hail a taxi ride using their smartphone, will allow customers to book trips days or weeks in advance in London, the first European city to get the option.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=o_M53PQ3Nlg:lVORnhyln8E:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=o_M53PQ3Nlg:lVORnhyln8E:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=o_M53PQ3Nlg:lVORnhyln8E:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=o_M53PQ3Nlg:lVORnhyln8E:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=o_M53PQ3Nlg:lVORnhyln8E:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/o_M53PQ3Nlg" height="1" width="1" alt="" />