The Ghanaian authorities will block about 10 million Sim cards by the end of this month as the registration window draws to a close.
The communications authority and industry regulator will on 31 October disconnect data and voice services of unverified cards after a year of nationwide registration campaign.
In July, the communication authority extended the deadline for verification by two months to allow Ghanaians and non-citizens resident in Ghana to link their identity cards to their Sim cards and complete the registration process.
By 4 October, about 19 million Sim cards were fully registered, representing about 45% of all the cards issued.
Sim card owners must link their Ghana national cards to their Sim and then proceed for full registration and biometrics capture with their service providers.
The government says the aim of the Sim registration exercise is to protect users against fraud and ensure digital security.