I got the LGPRS libraries by downloading them from the mediatek site. They were written for the LinkIt board(Seeedstudio) which uses the same Mediatek 2502 chip as the RePhone. However, the libraries aren’t entirely cross-compatible. Regardless, here is how you get them.
http://labs.mediatek.com/site/global/developer_tools/mediatek_linkit/sdk_intro/index.gsp
Also, the Mediatek 2502 SDK plug-in for Eclipse has a few more built-in GPRS examples than the Arduino for Rephone does. Like TCP. My programming skill level isn’t strong, so working with Eclipse has been a challenge. Maybe you will have an easier time of it. Note that not all of the eclipse examples work on the RePhone. Wifi in one. The linkit board has wifi. The rephone does not.
http://labs.mediatek.com/site/global/developer_tools/mediatek_linkit_assist_2502/sdk_intro/index.gsp
It really would have been great if the RePhone team had ported over ALL of the GPRS related libraries and examples to the Arduino IDE for Rephone. Since the core of the RePhone is its MediaTek GPRS module 
Whether they plan to or not is anyone’s guess.