Ardunio gsm shield not working-URGENT

I am working on a project due in four days. I need to send a sms with this shield- http://www.amazon.com/gp/product/B00TEU ... UTF8&psc=1. i have activated the sim(net 10) and it works in a cellphone. Acording to the light on the shield it has connection. I am using this simple sketch http://www.instructables.com/files/orig ... QPQW3U.ino When i run the sketch the serial monitor says "Write your SMS: " I enter my message the serial print out says " send sms..." signifying that the sms is sending. In a minute it prints "success!" I never receive the sms. If you have any idea what may cause this please respond soon, i urgently need it for a school project. Thanks

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