Dude, I don’t advise you to use your number to receive confirmation codes, because you can’t be sure of confidentiality. Think these sites can just sell the database with numbers and get a lot of money from hackers. To avoid problems later, you better just use service for receiving SMS on a one-time number. Yes, it costs money, but adequate and your safety is most expensive. Besides, this is one of the most reliable and popular services that provide such services,I'm talking about www.mobilesms.io . So in a friendly way I recommend that you familiarize yourself and think carefully about whether you are ready to risk your data.