To curb such problems, the most popular messaging app WhatsApp has rolled out a ''Change Number" feature on its Android beta update that gives a user freedom to change his/her number with no worry of loss of data and chats.
The new "Change Number" feature update is currently available in the 2.18.97 Android beta update on Google Play Store. It will come in iOS and Windows devices very soon. The feature gives access to users to migrate their data to a new number and their old chat history will sync to the new chat on the recipients' phone.
It also allow users to notify selected contacts about the new number change. This new feature is very simple to use, all you need to do is go to "Changer Number" option in WhatsApp Settings and then Account.