"Twilio provides both regular phone numbers with SMS and MMS capability and short codes, the latter primarily for high-volume outbound messaging."
Your parent is correct - you've missed each others' points.
Twilio sourced numbers cannot receive SMS from other shortcodes. No exceptions. They are not "mobile" numbers.
So yes, your twilio sourced number can send and receive SMS and you can even rent a shortcode from twilio and send/receive with that. What you cannot do is get a "normal" twilio number and receive shortcode messages.
For that reason, providing a twilio number to a provider like twitter or facebook will not work - they all typically send their auth messages via shortcode.
Your parent is correct - you've missed each others' points.
Twilio sourced numbers cannot receive SMS from other shortcodes. No exceptions. They are not "mobile" numbers.
So yes, your twilio sourced number can send and receive SMS and you can even rent a shortcode from twilio and send/receive with that. What you cannot do is get a "normal" twilio number and receive shortcode messages.
For that reason, providing a twilio number to a provider like twitter or facebook will not work - they all typically send their auth messages via shortcode.