What are the ways to verify the number?

Question

SMS

My project will critically need a number verification function (before registration or password recovery). But SMS APIs are too expensive (for example, on Laravel Nexmo - from 14K rubles.) Naturally, there are no such funds yet. Yes, and our domestic services also work from the mower and more. How can you verify phone numbers more or less well? Then I'll save some money and connect a regular SMS gate.

Answer 1

On Twillio, the rates are 2 rubles per SMS. There is no subscriber.
https://www.twilio.com/sms/pricing/ru

Answer 2

https://virtual-sim.ru/category/virtualnye-nomera