They exist, but this is likely a very bad idea. Most services that I've found, once you use a mobile number with them they never really remove it and the next thing you know, they are sending some stranger SMS messages to change your password per their "secure" 2FA requirements.
I can confirm this is a bad idea. Many many services permanently use it as some kind of fall back recovery, even after the phone number is removed and recycled and no other one is added.