Now it's easier to inform everyone on WhatsApp, or even specific people, about the change. There are three alert options – notify all contacts, notify contacts who you have a chat with, or you can manually choose who to alert. However, even if users choose not to notify their contacts, all groups they were in would still be notified. In a post by WAbetainfo, this feature was part of a roll out for WhatsApp beta for Android users and could be accessed by selecting the Change Number option under WhatsApp Settings -> Account. Another important use of the Change Number feature is that it allows users to migrate their data – like chat histories – to the new number.

Source: The Star April 03, 2018 05:15 UTC