(Reuters) - Now, all you need is a phone number to start a video call with any contact who uses an Android- or iOS-based smartphone.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=g1ulJvXKvvA:rBZ54R92tBM: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=g1ulJvXKvvA:rBZ54R92tBM:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=g1ulJvXKvvA:rBZ54R92tBM:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=g1ulJvXKvvA:rBZ54R92tBM:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=g1ulJvXKvvA:rBZ54R92tBM:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/g1ulJvXKvvA" height="1" width="1" alt="" />