Telegram Registration and Login Guide

Summary

To successfully register and log in to Telegram, you must use the official client. It's also recommended to enable two-step verification to enhance your account security.

First-time Registration: You must use the official mobile client to register. This is essential for receiving the verification code via SMS.
Desktop Client: If you try to register using the desktop client, you will be prompted to complete the registration via the mobile app.
Third-Party Clients: When attempting to use third-party clients, you might be prompted to send a verification code. However, Telegram has officially disabled registration and verification code functionality for these types of clients, meaning you won't receive the SMS.

Existing Account: When logging in again, the verification code will be sent directly to your already logged-in device(s).
Without Two-Step Verification Enabled: Log in using the 'mobile number + verification code' combination.
With Two-Step Verification Enabled: You will need to enter the 'mobile number + verification code + two-step verification password' to log in.

It is strongly recommended to enable Telegram's two-step verification to protect your account security and privacy.
Regularly check and update your privacy settings to prevent information leakage and avoid being unnecessarily added to groups.