I connect my phone to a bluetooth device for calling and I don't get any sound. Phone app switches to handset. I try changing back to Bluetooth and it doesn't take. Does switch to speaker though. Tried resetting network settings, clearing cache, repair through XC. None of it works. Same issue I had on my Nexus 6P, which got resolved in 7.1, do obviously a software issue that Sony did not fix. Now what do we do? Lots of other Bluetooth issues in this forum.