Voice over LTE is supposed to work using IMS - but will require a fairly expensive upgrade to the network. Operators are keenly aware of the pitfalls of over-th

Voice over LTE is supposed to work using IMS - but will require a fairly expensive upgrade to the network. Operators are keenly aware of the pitfalls of over-the-top voice losing them revenue, but this is an experiment to see if they can do away with IMS altogether. That, and the fact that someone else may try it first...