If you find “Unsupported User” in your chat or global search, your app is outdated.

1️⃣ Outdated apps won’t be able to log in (and sign up) with SMS/calls, but they can log in with login code from Telegram Notifications to other device/app or QR code from Desktop/browser.

2️⃣ Outdated apps can still be used to chat with non-64bit users normally.

3️⃣ Outdated apps still receive messages from 64bit users as @UnsupportedUser64Bot, all of them are grouped together in one chat and can't be replied to.

✅ Please update your app to the latest version. Official apps can be updated at: https://telegram.org/dl