Mobile operator voice revenue will drop to $208 billion by 2024 from $381 billion in 2019, as users shift to flexible and free OTT (Over-the-Top) services.

Operator voice revenue will decline 45 percent by 2024 due to an increase of 88 percent in the number of third-party OTT mVoIP users over the next five years.

Subscriber base for third-party OTT voice services will be nearing 4.5 billion users by 2024, according to a new study from Juniper Research.

5G proliferation will propel a number of nascent mobile voice and video services; generating fresh revenue streams for service providers.

The study urges operators to invest in AI-enabled communications platforms that facilitate competitive voice service delivery.

Improved 4G coverage will boost the number of mobile video call users; partially offsetting voice revenue losses. ViLTE (Video over LTE) operator revenue will exceed $33 billion by 2024.