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Which is Better SMS-OTP, Missed Call OTP, or WhatsApp OTP?

Explore the different options for one-time passwords (OTPs) and learn which is better for your authentication needs. Discover the pros and cons of SMS-OTP, missed call OTP, and WhatsApp OTP here!
by fazpass
December 24, 2022
missed call otp, sms otp, fazpass

A one-time password (OTP) is a common authentication method that can be used to secure access to various accounts and online services. There are several different ways to send OTPs, including via SMS messages, missed calls, and WhatsApp messages.

Each method has its own pros and cons, and it is important to take this into account when deciding which method to use. A one-time password (OTP) is a common security feature used to protect against unauthorized access to an account or system. They are often used in combination with usernames and passwords to provide an extra layer of security

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What is SMS OTP?

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The application of SMS OTP, users are sent a one-time code via text message (SMS) to their mobile phone. The user then enters this code into the website or app to complete the login or verification process. This helps ensure that only the phone owner can access the account, as the OTP is sent to a device that only the user can access.

OTP SMS is commonly used for banking, online shopping, and other sensitive transactions. They are generally considered a secure method of verifying a user's identity, but they can be vulnerable to certain types of attacks, such as SIM swapping, where an attacker gains access to the victim's phone number and can intercept OTPs sent to that number.

To protect against this type of attack, it is important to use a strong password and to enable additional security measures such as two-factor authentication (2FA), which requires the use of a second device or authentication method other than OTP


  1. OTP SMS is convenient for users because most people have a mobile phone and can receive SMS messages.
  2. OTP SMS is quick and easy to implement, as it can be sent and received using standard phone hardware and software.
  3. OTP SMS is relatively secure, as it is sent over a secure network and cannot be accessed by anyone who does not have access to the user's mobile phone.


  1. OTP SMS can be vulnerable to SIM swap attacks, where an attacker can gain control of the user's mobile phone number and receive an OTP intended for the user.
  2. OTP SMS is reliable in areas with poor cellular coverage or in cases where the user's phone is not turned on or is out of range.
  3. Some users may not want to receive SMS messages due to privacy or other reasons, and may prefer alternative methods of sending OTP.

Missed Call OTP, SMS OTP Indonesia, Fazpass

What is Missed Call OTP ?

Implementing a missed call OTP, the OTP is sent to the user's phone number via a missed call. Users can then retrieve the OTP by checking for missed calls on their phones and jotting down the displayed number.

This OTP can then be entered into the corresponding field on the website or application to complete the authentication process. It is important to note that OTPs are usually only valid for a short period of time, so it is important to use the OTP as soon as possible after receiving it. If the OTP expires before use, the user usually needs to request a new OTP.

Pro Missed Call OTP

  1. OTP missed calls are convenient for users because they do not require users to have a smartphone or internet connection.
  2. Missed call OTP are quick and easy to implement, as they can be delivered using standard phone hardware and software.
  3. It's easy for the user to understand Android even has autofill feature

Cons Missed Call OTP

  1. OTP missed calls are vulnerable to phone number spoofing attacks, where an attacker can make a call apparently coming from a different number than the one actually made.
  2. Missed call OTPs may not be suitable for use in cases where the user cannot receive phone calls, such as when they are in a meeting or on a plane.

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