title: Cheapest way to send SMS for number verification?
body: <p>My application needs to verify phone numbers that are provided by the user. What is the absolute cheapest way to send an SMS to a phone? Which company/API should I go to? I'm not looking for a hack solution to send out 10 SMS a month kind of thing, I need to roll this out for a company that will be sending mass amount of verifications. But they want to do it at the lowest cost. (Each user will only need to verify once)</p>
  
  <p>Sorry forgot mention the SMS needs to be international</p>