Yeah I totally agree, but on Google scale and for OTP codes, using middleman is not good practice. Especially with MNO blacklists etc, as they are actively figh

Yeah I totally agree, but on Google scale and for OTP codes, using middleman is not good practice. Especially with MNO blacklists etc, as they are actively fighting grey routes. Also with direct carrier connections you have options like one-shot SMS. If it is not delivered it is not retried. (which is useful for delays) Delay is a big problem when you have many middleman, imagine you are sending OTP code, let's say route is delayed somehow, user didn't get the message, he requested another one, then first one is delivering, but you've already invalidated that, user enters wrong code, requests again, until he locks out :)