Currently you can only send SMS to users in the tulip users table (as well as they have to be validated)
This is one method of sending SMS to anyone by putting a thin wrapper (api gateway & lambda) around the Amazon SNS service
this is awesome @mellerbeck, really nice write up. thanks for sharing!!
out of curiosity, did you also evaluate using Twilio 
or D7 to send the SMS messages??
again, thanks for sharing!!
gio
Hi Guys,
Any one has test sending SMS messages using Twilio?
thanks for your help,