Phones.com: $2.5 worth free credit for free SMS or call??

Phones.com, number one online phones comparison websites, is offering $2.50 worth credit.Thanks to Mr Driss from morocco for leaving comment about this site on 30th Jan 2009. I would request him to contact me meravikas--at--gmail.com to send a gift for him.I am not sure if you can use this credit to make the call, I tried 3-4 times and it seems that we can use that credit to just send SMS, not