The SMS methods contain local, international and mobile numbers (can be used for free trials). I've included three methods which can be used together.
Well, of course they are mobile numbers if they accept SMS, but are some of them real numbers as in real SIM card mobile numbers?
It's okay if they are all VOIP as those do work with many free trials like you said. However, there are several sites where VOIP numbers do not work (sites that I'm interested in).
Please let me know, thanks.