My mother made the decision recently to switch from a regular smartphone contract to a prepaid contract. It simply did not make sense for her to pay €30 per month for making a couple of calls, sending some SMS and using WhatsApp.
Along with the change came a new phone number. While it was easy enough to inform all her contacts about the new number, it took me a while before I discovered how to move all WhatsApp data to a new phone number.
There is one important reason why you need to inform WhatsApp about the move. If you don't, and someone else gets that number (as it gets back in the pool some time after the contract expires), data Whatsapp collected becomes available if the software is installed on the other person's device.
Since you don't want that, as it is a privacy-issue and can lead to social engineering attacks, you'd better make sure that this does not happen. And that is done by notifying WhatsApp about the change.
Changing your WhatsApp phone number
It is relatively easy to change the phone number provided that you know that it is possible and where to find the setting.
As soon as you verify the new number, the old gets deleted and is no longer usable. Someone else who registers it at a later point in time starts with a blank account.
All that is left to do now is to inform your contacts about the new number. This can be done directly in WhatsApp and should not be a big issue.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.