I use toodle-do as a to do list. Its help pages say "For SMS reminders, please enter the Email to SMS gateway addressprovided by your carrier."
The Virgin mobile format for this gateway address is widely documented (here for example) as firstname.lastname@example.org (where n is the phone number)
I have sent an email to this address for my number and to email@example.com so far nothing has happened.
The VM technical help desk denied all knowledge of such a gateway.
Has anyone else made this work?