After entering phone number, user receives a 5 digit confirmation code via
another Telegram app (if he’s using Telegram on another device) or
text message (SMS) or
fter 2 minutes: a computer voice call (in English)
SMS not received? Check if the number is written in the international number format (+112312345) and check if maybe an App (or even the mobile network operator) is blocking SMS from foreign countries. Remember that Telegram does not support VoIP numbers nor new landline numbers, so a real mobile number is required.