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Re:533M Facebook users' phone numbers and personal data have... by IG_Semmelweiss on Saturday April 03, 2021 @02:50PM (#26683624)
How are you able to send whatsapps to people you don't have a prior conversation with ?

I am doing the same boat...and was working fine until i lost & replaced my old phone. All conversations were lost, and this makes it challenging to use whatsapp for any non-group conversations (since I can't start any).

Re:533M Facebook users' phone numbers and personal data have... by TrianguloY on Saturday April 03, 2021 @03:01PM (#26683720)
You can start a conversation with any WhatsApp number by opening the url wa.me/number. The number must include the country prefix.

There are also some apps and webpages that helps with this process (Disclaimer: I'm the author of one of them for Android [0])

[0] https://play.google.com/store/apps/details?id=com.trianguloy...