I didn’t realize how regulated phone numbers are 
. But Twilio made the process pretty easy. Waiting for 24h to get approval to use a random mobile number seemed excessive. There are other providers who claim to be faster and cheaper than Twilio. But I was wary about using a company I hadn’t heard of before. Now that it’s set up, the provider is a non factor - it has worked as intended.
What other providers were you considering?
I only checked out Plivo and Telnyx. I hadn’t heard of either so went with Twilio.