Google’s history with Bluetooth is a bit rocky, but it looks like at least one Bluetooth bug in Android isn’t entirely Google’s fault. The so-called “phantom call” issue appears to be the result of a third-party app. Namely, Skype Lite. Uninstall that, and you should be all good.
The phantom call bug is an annoying one, so you’d probably know if it’s been happening on your phone. After a recent update, some users reported their phones would spontaneously switch to a phone call when connecting to Bluetooth.
The ‘phantom call’ Bluetooth bug is probably caused by Skype Lite was written by the awesome team at Android Police.