Hook for new user registration ?

I want to fire a curl call when a new user successfully registers (in this case, it basically just passes some data to Twilio to send them an SMS).

I need a good hook / filter I can use to catch that.

The data I would need from the UWP registration form would be:
Email Address
First Name
Phone (Field Created for the Account and Registration Form).

Does UWP have a hook I can use for this?