Glad to hear you got it working. I'm also working on a GSM project and would like to pass on a few things I've learned.
DON'T power it from USB. Use an external supply or battery capable of supplying the necessary current. The module will draw large amounts of current regularly (216Hz) up to 2 amps. It will cause intermittent network registration problems and could potentially damage your USB controller because the USB port simply can't provide the necessary current.
DON'T rely on delays between SMS sending to increase throughput. It can take anywhere up to 60 seconds for the module to acknowledge successful completion of an SMS. The most reliable approach is to wait for the acknowledge message before transmitting the next SMS.
Just a couple of things I've learned along the way.