Telecom regulator Trai has asked telecom companies to de-activate the international calling facility in prepaid numbers and restore it only after a subscriber gives his explicit consent to avail this facility.

"Inform all pre-paid subscribers having ISD facility, through SMS, within 10 days of the date of issue of this direction, that ISD facility of the subscribers shall be discontinued after sixty days," Telecom Regulatory Authority of India (Trai) said in a directive to telcos.

"If such subscribers want to continue with ISD facility, they should give their explicit consent for availing such facility within 60 days of the receipt of the SMS," it added.