What are the cheapest services for verifying a phone number by SMS?

Question

SMS

Hi all. Can anyone recommend the most budgetary and at the same time high-quality services for sending codes to customers in order to verify the phone number?
Perhaps there is confirmation in the form of calls? What's better?

Answer 1

Look at the SMS center, with the right approach, you can get a good price .
Confirmation methods of your choice:
In the section "API -> Libraries and Examples" there is an example of a form for verifying a phone number.