According to the instructions of Bangladesh Telecommunication Regulatory Commission (BTRC), a customer can use/register a maximum of 10 SIMs with a National Identity Card (NID and Smart Card).
From July 31, if 10 SIMs are registered, the next new SIM cannot be purchased. Customers cannot purchase more than 1 SIM card with other identity cards including passport, driving license, birth certificate.
To know how many SIMs are currently registered with your NID and Smart Card, dial *16001# or visit the MyGP app.