Primary Recovery Method: The phone number is the cornerstone of Telegram's account recovery process. If you lose access to your device or forget your password, a verification code sent to your registered phone number (via SMS or in-app call) is the primary way to regain access. This is generally more reliable than email-based recovery for many users.
Ease of Use: For legitimate users, it simplifies the process of logging into Telegram from new devices or after app reinstallation.
Foundation for Two-Step Verification (2SV/Cloud Password):
While the phone number is the first factor for login, Telegram strongly encourages users to enable a Two-Step Verification (Cloud Password). This adds a second layer of security (a password only you know) that makes a phone number compromise much less dangerous. If 2SV is active, even if someone intercepts your SMS code, they still need your password.
Multi-Device Security:
The phone number-based login allows Telegram to telegram number database manage and display "Active Sessions." Users can see all logged-in devices and remotely terminate any suspicious sessions, providing immediate control over their account.
II. Negative Security Implications (Risks & Vulnerabilities)
SIM Swapping / SIM Hijacking:
Major Threat: This is arguably the most significant security risk tied to any phone-number based authentication system. A SIM swap occurs when an attacker convinces your mobile carrier to transfer your phone number to a SIM card they control.
Impact: Once the attacker controls your phone number, they can receive SMS veri.