> Most likely they are sending SMS from a short-code - and a short-code cannot send SMS to a non mobile number. Sure you can. We do it all the time at my job,

> Most likely they are sending SMS from a short-code - and a short-code cannot send SMS to a non mobile number. Sure you can. We do it all the time at my job, for sending reminders of appointments and medication refill notices and such. We have test recipient numbers on all of the mobile networks and the big VoIP networks like Republic Wireless and Google Voice. I even have a test number from voip.ms on there. The requirement is that the owning carrier of the number have a partnership with the short code provider platform. Twilio famously doesn't want to pay for that partnership. Bandwidth.com, that operates the bare metal of a lot of VoIP companies, does pay for it.