My Note 3 immediately drops all signal to almost nothing the moment WiFi connects. Where I am, I have 4 bars with LTE on. Once I enable WiFi and connect to AP, signal goes to zero bars.
Initially I thought it's cosmetic. But after some testing, I realized that it is not. About 40% of all calls go to voicemail. When I do get a call that comes through, if it's HD voice, I sound to them like latest T-Pain's album, like I am being auto-tuned. When it's not HD voice, it's simply breaking up.
WiFi calling does not kick in.
And weirdly enough, it's happening to my girlfriend's Nexus 5, also on T-Mobile.
SIM and region unlocked with Chainfire's utility.
Any help would be greatly appreciated.