Change phone number to Telegram

1. Change number in Telegram
   Put the new SIM card with the new SIM card into your smartphone on which Telegram is installed so far.
2. Opens Telegram. ...
   In Telegram, tap on the menu icon (☰) in the top left and on "Settings".
3. Tap your old cell phone number at the top.
4. Tap the "Change number" button at the bottom.