Look like TRAI direction on ISD facility to prepaid cellular mobile telephone service is in effect. My service provider asked me to send SMS to activate ISD facility on my prepaid number. Check out TRAI press release below.
With a view to protecting the interest of prepaid cellular mobile telephone service consumers from the menace of missed calls (wangiri calls) and calls relating to winning of prizes or lottery from international numbers, the Telecom Regulatory Authority of India (TRAI) today issued a Direction to all Access Service Providers regarding provision of ISD facility to prepaid cellular mobile telephone service consumers and advisory to consumers through SMS at periodic intervals.
TRAI has been receiving complaints from consumers about missed calls from international telephone numbers, which are often premium numbers charging high tariff, prompting the consumers to make call to such numbers. TRAI has also been receiving complaints from consumers about calls and SMS from international numbers informing them about winning of prizes or lottery and prompting consumers to call a particular number to claim the prize or lottery money. These numbers are international numbers, which are often premium numbers charging higher tariffs. By responding to such calls/SMS the consumers have to pay unintended charges. [Read more]