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I've seen this on Telegram but never on Signal. I use Signal on both iOS and Windows.

I uninstalled Signal and haven't looked back due to the constant `X from your address book has joined Signal` notifications that you can't disable.

Except that, you can actually disable them.

Well that's new then. You used to not be able to.

There's a setting for it on Android at least:

Settings > Notifications > Notify When > Contact joins Signal

I think you can turn that off with telegram, but I'm not sure if it's still the case.