Iphone 6 plus wifi calling

i have an iphone 6 plus unlocked and switched to metropcs now I do not get service in my house and I think y to enable wifi calling but it just won't turn on when i switch it it asked me if i want to enable it and press ok then a screen comes up to update e911 so i hit save then it goes to another screen and the only option is to hit close then it just goes back to tue setting which is not turned on so i switch it on and it just keeps repeating this process but never acctually turns on? Please help!!!!!