Comment Re:Carrier aproved phone? (Score 1) 53
Carriers in the United States are required to support e911 customer-location reporting. With the switch to LTE, this means you cannot do tower-based aGPS location to satisfy this reporting. All VoLTE implementations are VoIP stacks that need external pieces to handle geolocation for emergency services.
As a result, only phones with a carrier-compatible VoLTE stack are able to function to e911 requirements. Carriers have been using this to lock out "uncertified" devices -- the argument being that "your phone can't do our VoLTE e911 solution, so we can't let you talk on our LTE bandwidth."