sms

I have a food delivery website and I want to make the verification by sms equal to that of gooogle and facebook, for when the person makes the registration the verification is activated. thus avoiding fraud and bad games. How does this part work? do I need to hire a telephone operator? is there a plugin that does this? which is the best at the moment? I need something that works to speed up the registration, if anyone knows how to inform me I am very grateful.