The messaging feature has always been hit-or-miss for me. I have a Nexus 5 with Android 5.1 and use Hangouts for text messaging. Sometimes messages that come through my carrier number in Hangouts will display on the RAV4, Google Voice messages and internet Hangouts messages never do. There's no rhyme or reason as to when it works but it does seem to work more consistently within the first few weeks after an Android OS upgrade.