This comes ahead of an audit of the Subscriber Registration Database.

In a statement on Wednesday, Director, Public Affairs, Ikechukwu Adinde, said the directive will be in effect until the audit is completed.

He noted that the Minister of Communications and Digital Economy, Isa Pantami, instructed the NCC to conduct the exercise.

However, an exemption might be granted if the federal government approves.

NCC warned that non-compliance by network operators could lead to withdrawal of operating license.

The inspection is to ensure that the firms comply with quality standards and requirements.