WhatsApp is rolling out the Android 2.23.15.14 beta version that brings the ability to initiate a group call with up to 15 people. The update is currently in the testing phase and is available to a handful of beta testers via the Google Play Store.
To those who are unaware, WhatsApp already supports 32 participants in a group voice or video call. However, while initiating these features, one could only connect with up to 7 persons at a time, and can easily add others or remaining contacts afterward.
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In the latest development, the company has changed this way. As of now, WhatsApp users can directly choose up to 15 people in a group call without any restriction. Eventually, this enhanced the convenience of selecting participants during the conference call creation process.
[Source]