If a roaming subscriber connects to a visited network that also no longer supports 3G, the subscriber then must have a VoLTE-enabled device, and their home network must also support VoLTE, in order for them to make a voice call and subsequently use data over that device while roaming.

Evolved Mobility allows 4G- and 5G-only operators to support 3G fallback for voice calls so that these calls could be made via VoLTE. This allows users on non-VoLTE networks to seamlessly make VoLTE-powered calls.

Evolved Mobility allows visited operators to effortlessly accept 4G connections across numerous networks and is intended to give non-VoLTE network operators a way to roam without either side having to make major equipment upgrades. Now preferred networks can offer voice and data services without the use of VoLTE, giving roamers seamless connections to both voice and data, resulting in a mutually beneficial outcome for both roaming subscribers and mobile network operators.

Without the ability to connect to non-VoLTE-enabled operators, 4G- and 5G-only operators stand to lose a considerable amount of their roaming partnership business.

If a roaming subscriber is unable to connect voice services to a visited operator’s network, then they are also unable to connect to data services. This results in significant lost roaming revenues for visited operators, less roaming competition leading to higher roaming rates and ultimately dissatisfied subscribers.