Can a virtual number be used later by another person to access my old accounts?

Virtual numbers can be reassigned to others after expiration, allowing new users to potentially access SMS-based codes linked to your old accounts. Proper use and caution are essential to protect your security.

Can virtual numbers be reused by others?

Virtual phone numbers are rented from providers for temporary or extended use. After the rental period expires or the number is released, it is often returned to the provider's pool and reassigned to a new user. This means that virtual numbers can indeed be reused by different people over time.

Unlike personal mobile numbers tied directly to a single subscriber, virtual numbers are a shared resource offered on demand. For example, you might rent a number to receive an SMS verification code for a service like WhatsApp or Google. Once your rental ends, the number can be rented again by someone else for a completely different purpose.

Security risks of virtual number reuse

The main risk arises when old accounts remain linked to a virtual number that is subsequently reassigned. Here is why this can be problematic:

• OTP interception: SMS-based one-time passwords (OTPs) or verification codes sent to the old number can be received by the new user, enabling unauthorized access.
• Account recovery: Some services allow password resets or account recovery via SMS code, which can be exploited if the number is no longer securely controlled.
• SMS forwarding or spoofing: While less common, malicious actors may also try to forward or spoof messages if they gain access to reused numbers.

Not all virtual numbers immediately get reassigned, but the timing varies by provider and country. Some numbers may remain inactive for days or weeks, while others are quickly recycled.

Best practices for using virtual numbers securely

To mitigate risks associated with reused virtual numbers, follow these security recommendations:

• Use virtual numbers only for low-risk or temporary accounts. Avoid using them on critical services such as banking, email, or social networks with sensitive personal data.
• Update your contact details regularly. Once you no longer control a virtual number, immediately change your phone number on all linked accounts.
• Prefer app-based or hardware two-factor authentication (2FA). Apps like Google Authenticator or hardware keys provide stronger protection than SMS.
• Do not reuse the same virtual number for multiple accounts. This lowers your attack surface by limiting exposure if the number is reassigned.
• Monitor account activity. Watch for suspicious login attempts or unexpected password reset requests.

How SMSVerifier handles number reuse

At SMSVerifier, we partner with multiple upstream providers to offer a wide variety of virtual numbers across 200+ countries, supporting over 4,000 services. Our platform is optimized for fast SMS delivery and transparent number lifecycle management.

However, despite these safeguards, once a number expires and is returned to the pool, another person may rent it. We recommend using SMSVerifier numbers for temporary verification tasks rather than long-term account protection.

Alternatives to virtual numbers for two-factor authentication

Because SMS-based 2FA has inherent vulnerabilities including number reuse risk, consider these more secure options:

• Authenticator apps: Google Authenticator, Authy, and similar apps generate time-based codes without relying on phone numbers.
• Hardware security keys: Devices like YubiKey provide phishing-resistant 2FA.
• Biometric methods: Fingerprint or face recognition where supported by services.