The name of the app is “open in whatspp” its on f-droid here:
https://f-droid.org/en/packages/io.github.subhamtyagi.openinwhatsapp/
or search the /e/app store for “Open In Whatsapp” the /e/ app store gives it 10/10 for privacy
the gitlab link is here https://github.com/subhamtyagi/openinwa
What it does:
when u launch it, it brings up dialog to enter the phone number or Pick from contacts , you wish to send text to, and then u can chat. found some screenshots online plz note those screenshots are from older version. i dont know how to take screenshots of my phone, but there is a button to choose contacts from the phones address book, which wont share your whole phone book with whatsapp
As you have a registered number with whatsapp etc its able to text with other registered users without it having access to your phone book, they should still be able to text you normally from their end.
I think you can make calls also, but not sure
The only issue you will have is that you wont know who`s texting/calling as whatsapp doesnt have access to your phone book to tell you. So all you will see is their telephone number. The person calling texting will have u saved to their contacts so they know it you, but you wont know its them, unless you recognize the number.
If you have 900 contacts this could be hard to identify the incoming text/call…
Screenshot from the version installed from the /e/ App Store
