Welcome to the droidymcdroidface-iest, Lemmyest (Lemmiest), test, bestest, phoniest, pluckiest, snarkiest, and spiciest Android community on Lemmy (Do not respond)! Here you can participate in amazing discussions and events relating to all things Android.
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Community Resources:
We are Android girls*,
In our Lemmy.world.
The back is plastic,
It's fantastic.
*Well, not just girls: people of all gender identities are welcomed here.
Our Partner Communities:
In addition to the ones listed:
Matrix client (Element, Shildichat, Fluffy chat, etc.)
XMPP client (Conversations, Monocles Chat, Blabber, etc.)
SimpleX Chat
Briar
None of them are tied to your phone number if that's what you mean by non voip.
I vote for matrix / fluffy chat
Signal recently added usernames. I'm not sure if you still need a phone number to sign up, though.
Jami? Also Nextcloud Talk though my results with that haven't been great. I've been wanting to try Jami.
Jitsi
I think you're confusing things. VoIP means voice over IP. So anytime you can talk to somebody over the internet, you're using a form of VoIP.
To have an app that doesn't use voip but lets you talk over the internet is a contradiction and just confuses your question.
I think you're real question is: what voice and messaging apps don't require a phone number registration
https://www.privacyguides.org/en/real-time-communication/
From the above your options are: simplex, element / matrix