Warning - if you see matrix counter at airport, stay away - they"re crooks.
To say that i got hoodwinked by the people at matrix is understatement. Their charges are ourageous. I got a bill for rs.10000 for a travel to japan. I cancelled it immediately and sent back the sim card to them by post. Now they claim, ive to return the sim card and keep harrassing me with mails to return the sim card.