Well, I really needed a good phone asap, so I "upgraded " to an S7. Obviously, from S6 Edge+ to S7 is not quit an upgrade, but as a phone S7 is miles away, works much better even on the regular network and VoLTE and Wi-Fi calling work perfectly too. I think there is a serious issue between S6 line and Videotron's network, my second phone on my contract, an S6 Edge, has the same problems like my S6 Edge+.