Alternative method of authorization in Telegram
The beta version of Telegram for iOS is testing an alternative authorization format. Now, when entering the account, a reset call is sent to the user's number. To complete authorization, the user needs to enter the last 5 digits of the phone number from which the incoming call will be received.
Now this technology is becoming more and more popular among services. One of its main advantages is saving money on sending SMS to users. According to the uCaller service, the cost of this method of sending a code can be 3-5 times cheaper than the classic transmission of a password in a message.
In addition, with its help, the messenger will be able to protect itself from the services of virtual SMS reception, which are used to register bots.