(Reuters) - Alphabet Inc's Google is expected to unveil new smartphones at an event on Tuesday, the company's latest effort to sell consumers on a Google-branded device and to challenge Apple Inc at the high end of the market.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=K2DtW3tLxQU:6TE9ZebaTds: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=K2DtW3tLxQU:6TE9ZebaTds:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=K2DtW3tLxQU:6TE9ZebaTds:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=K2DtW3tLxQU:6TE9ZebaTds:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=K2DtW3tLxQU:6TE9ZebaTds:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/K2DtW3tLxQU" height="1" width="1" alt="" />