Telegram works without Google, check it.
DeGoogle Yourself
A community for those that would like to get away from Google.
Here you may post anything related to DeGoogling, why we should do it or good software alternatives!
Rules
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Be respectful even in disagreement
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No advertising unless it is very relevent and justified. Do not do this excessively.
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No low value posts / memes. We or you need to learn, or discuss something.
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you're fine using lineageOS with microG and utilising it for cloud messaging, i.e. notifications. the actual content of the notfication doesn't go through google (or apple), a push message just signals the telegram client there's activity. then the telegram client wakes up, fetches the message from telegram servers, constructs the notification in-app and then displays it.
google doesn't have access to the contents of it, but harvests lotsa metadata that microG (as opposed to full-featured play store services) somewhat ameliorates.
having said that, you should make every effort to ditch telegram as well, for a buncha reasons.
you don't. delete your google account and use it through front ends.
in this case microg. which is not exactly a front end, but its much better than the official google push notification system.
For that I need root or custom roms, the warranty of this phone has not yet expired...
restore to stock rom before sending in your phone.