International user registration via SMS
I've noticed a lot of mobile apps, specifically messaging apps, are switching from email verification to SMS'ed auth codes. Being based in the US, I am wondering how this works for international users. It seems illogical that users always receive an SMS from a US-based number.
Twilio Evangelist here,
We have a lot of people using Twilio for this, sending an SMS to the user with an authorisation code. I'm actually based in the UK, and I get them from all sorts of different numbers. Some companies use short codes (4/5/6 digit numbers), some companies use a regular long code number.
Unlike the US, we have mobile number ranges in Europe, so you can tell the difference between a mobile and landline number. Although UK landline numbers can weirdly send and receive SMS...
The experience is fine - if I've just completed some action on a web page or an app, I'm expecting the SMS, and I seldom even notice the number they came from. In fact, to answer this I had to look through my received messages to see what numbers were being used!
Hope this helps.
But there's no reason they can't send it from the U.S only though. There is a chance that it is blocked as spam perhaps.