The SMS receiving sites don't work so well IME. They tend to use a single number for everyone, and the demand by spammers etc is so much higher than the free supply that for any given service, your number will probably already be blocked. Or the receiving will be unreliable, etc. I've gotten it to work sometimes, but usually not. Definitely too hard and time consuming for "normal people".

Is there a site that sells phone numbers for viop and sms for bitcoin without requiring identity?