This is an old arduino 3G module bought half years ago.
Its wiki:
http://wiki.iteadstudio.com/ITEAD_3G_Shield
Its mall:
http://imall.itead.cc/itead-3g-shield.html
Datasheet for ITEAD 3G Shield http://pan.baidu.com/s/1ntCH4UH
Schematic for ITEAD 3G Shield http://pan.baidu.com/s/1pJ5lRzt
Demo Code for ITEAD 3G Shield http://pan.baidu.com/s/1gdyaCYf
Its back where you insert a SIM card:
This board uses AT commands to control itself.
Key: AT commands
What is AT commands?
For Chinese readers: http://baike.baidu.com/view/2420376.htm
For English readers: https://en.wikipedia.org/wiki/Motorola_phone_AT_commands ( This is very helpful )
The AT commands manual those are compatible for this board can be found here.
http://wiki.iteadstudio.com/images/2/20/SIM5215J_SIM5216J_AT_Command_Manual_V1.02.pdf (You do not need to be an expert)
It looks the manual is long enough to make you sleepy. :P Just check the exquisite down below.
But as you can see that, the download link does not exist anymore. But after googling a bit, there are some alternatives for you to download the goodies.
DS_IM121026002_3G_Shield.pdf:
You can find helpful tutorials from Arduino offcial forum:
http://forum.arduino.cc/index.php?topic=140526.0
And the problem was solved. You can use that scope of codes.
Arduino 3g shield using GSM bought from ITead
原文：http://www.cnblogs.com/spaceship9/p/4760859.html