Telegram requires a phone number to create an account, but unlike most messengers it is designed to be used with the number hidden: after signup you can set a username and disable phone-number visibility entirely. That makes a one-time virtual number from Get-SMS a natural fit — the number is only needed for the first SMS code, and afterwards your contacts see your @username, not the number.
Registration is straightforward: pick a country, take a number, enter it in the Telegram app or on the web version, and the 5-digit code arrives within seconds. Telegram accepts virtual numbers noticeably better than WhatsApp, so failed registrations are rare. If a number is rejected or flagged, cancel it free of charge and take the next one.
Telegram occasionally puts new accounts from «cheap» number ranges under limitations (they can message only users who have them in contacts). This lifts automatically with normal usage. Numbers from the USA, UK, and Western Europe get such limitations less often; Indonesian and Kazakh numbers are the budget option and work fine for personal use. One more nuance: if you plan to log in from several devices, do it while the account is fresh — Telegram sends login codes to the app itself once a session exists, so the virtual number is not needed again.
Important: never use throwaway numbers for an account you cannot afford to lose. For a durable second account, rent a number for 30 days — that way you can receive a login code again if all sessions expire.