It may be that, while registering your SIM, you have unknowingly registered a few more SIMs with your NID. There is a way to get rid of this unwanted problem.
You can easily find out how many SIMs are registered in biometric system using your national ID (fingerprint) and fingerprint. Dial the following number from the specified operator and find out the SIM numbers registered in your NID.
Grameenphone: Enter info and send SMS to 4949
Banglalink: Dial * 1600 * 2 #
Robi: Dial * 1600 * 3 #
Airtel: Dial ** 1 #
After dialing you will be informed of the SIM numbers registered in your NID. Now if you find an unfamiliar SIM number, call the respective mobile customer service and turn it off.
Meanwhile, recently registered SIM sales have been reported in various areas of the country. There is also news of one person's SIM registering another. The registered SIM has also been reported as fraudulent. However, it is believed that this will not be a problem if operators inform their customers how many and some SIMs are registered in an NID. At the same time, if a SIM is registered to a customer ID, the customer can remove or shut it down if desired.

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