Airtel has this message for all of us on their homepage:

“Unsolicited fraudulent SMS’s are being sent to various subscribers informing them that they have won a prize and need to call an international number to collect their prize. When calls are made to the number in the text message the subscribers are billed a high amount (upto Rs 500 per minute).Subscribers are cautioned not to respond to such SMS’s”

Is this the mobile version of the famous 419 Nigerian Scam?