WhatsApp rolled out a new update for beta testers WhatsApp_2.18.97. Now a use can charge his or her number without logging out from WhatsApp. Not only that now user can notify everyone about the new number also.
Follow the below mentioned steps :
This new feature is currently only available on WhatsApp beta for Android, but will soon become available to iOS and Windows as well. If you are a beta tester, you can update the app directly from the Play Store.