title: Issue with firebase phone auth, not sending verification SMS
body: <p>My app uses firebase phone auth to allow users to register, the issue is that I don't receive any verification code. but when I use a VPN app and try, it works!!</p>
  
  <p>am sure that there is no issue in the code, since it works when I use a VPN. am wondering is it cause of my current location (I am based in Sudan)? although Sudan is listed in among the countries where the service is offered too in the documentation.</p>
  
  <p>I think it could be that google services doesn't work here? but play store, other features etc. work like a charm. I know Sudan is under US sanction, so are other countries - does that mean this feature wont work at all?</p>
  
  <p>If anyone knows whats going on let me know please!
  Thank you</p>