Steam does not require a phone number to create an account — but you will need one almost immediately if you actually use the platform. The Steam Guard Mobile Authenticator, community market access, and trade confirmations all ask for a verified phone. A virtual number from Get-SMS covers the SMS step, so you can set up a trading-ready account without linking your personal number.
The flow is standard: add the number in Steam account settings, receive the SMS code, done. Steam is not picky about number origin — most country pools are accepted, and there is no aggressive re-verification later. Keep in mind the 15-day rule though: after adding or changing the authenticator phone, market and trades are held for up to 15 days. Plan account setup ahead if trading matters to you.
If you plan to keep the account long-term, consider renting a number for 30 days instead of a one-time activation: Steam occasionally sends confirmation SMS when you change account details or remove the authenticator, and having access to the same number makes those changes painless. For one-off regional accounts (for example, to check regional pricing) a one-time number is enough — Steam ties the store region to your payment method and IP, not to the phone country code.
If Steam rejects a number with «this phone number can't be used», it was linked to too many accounts before — cancel it for free and take another one.