T-Mobile has finally begun the rollout of its VoLTE network that allows users to make voice calls using LTE connectivity. Currently most devices default to older and slower connections to make voice calls. The catch to the VoLTE network is that only certain devices support the capability.
Devices that can support the VoLTE network include the Galaxy Note 3, LG G Flex, and Galaxy Light. The iPhone 5, 5S, and 5C can technically support the network, but that support is unlikely to happen. The LTE chip inside the iPhone models is the Qualcomm MDM9616m, which can support VoLTE. However, the iPhone is unable to support a phone call and web surfing at the same time on a LTE network.
That would mean if you are browsing the web and a phone call comes in, the web pages would have to close to answer the call. That is something that Apple doesn’t want to deal with and would be irritating to users of the device. Therefore, Apple isn’t expected to roll out the carrier update that would be needed to allow its iPhone models to support VoLTE. Being able to surf the web and make a voice call is important to many iPhone users.
via TMonews