Scammed!

There's an SMS message doing the rounds that says if you forward it to 10 other people you will get 25 dirhams credit added to your balance:

"Congratulation! 2 day is anniversary of Etisalat. So forward this sms to 10 other people u will get free balance of AED 25/"

In a moment of stupidity I forwarded it on and realised, after an hour of no extra credit, that I'd been scammed. Sorry to the 10 people I forwarded it to, I hope you're not as stupid as me...