3 ms·

So has T-Mobile. Any sufficiently fast wifi network becomes a mini network tower. It's a great idea.

• toomuchtodo 12y ago
  To offload to wifi, the wifi doesn't even need to be fast. Voice traffic uses very little bandwidth. The connection simply must have low packet loss and as little latency as possible. When in non-T-mobile coverage areas, I use my Verizon hotspot for wifi calling with my T-Mobile iPhone, even if the hotspot can only provide 2/3G.
  • eli 12y ago
    True, that's what I meant by fast. I think it's only something like 30kbs, but it needs to have low packet loss and low jitter or the call will be garbled.
• Osiris 12y ago
  When I had WiFi calling on T-mobile it still counted toward your minutes, so there was really no advantage to it in terms of billing, only in case of poor cell coverage.
  • eli 12y ago
    Correct, though I think almost all the plans they sell now are unlimited minutes, so the billing is irrelevant