VR friend-friend calling (phone call)
-First set VR guest armchair in your home environment
-If friend calls you -they materialize into your Home chair
-If you call your friend, you appear in their guest chair in their Home
-locomotion-wise, this will be static but you can look around at your friend's "Home"
-(the guest chair could be a designated seat on a sofa or an armchair)
It'd be cool if the person you called's avatar head popped up as a hologram on your wrist watch or something too