Which service to choose for sending sms with api?

Question

API

Hello. Can you tell me a good service for sending sms from the site? Necessary for the bulletin board so that visitors can send SMS to the ad owner. About three years ago, I already implemented something similar, but since then a lot has changed, the service that I used has closed, the conditions for another have changed. Of course, I can google, for example, the sms.ru service seems to be according to the description of the norms, but I would like to know the opinion of the community.

Answer 1

sms.ru
smsc.ru