I found a really cheap GSM module:<br><br><a href="http://www.mdfly.com/index.php?main_page=product_info&amp;cPath=8&amp;products_id=326&amp;zenid=duvlldf9j7pk1ilupkdilr09d1">http://www.mdfly.com/index.php?main_page=product_info&amp;cPath=8&amp;products_id=326&amp;zenid=duvlldf9j7pk1ilupkdilr09d1</a><br>

<br>Haven&#39;t dug thru the datasheet to see how it compares to the more expensive ones.<br>