gprs控件使用方法，里面介绍了如何通过gprs模块进行网络连接，实现上网的功能-The GPRS control uses the method, which describes how to network connection through the GPRS module, to realize the function of the Internet

手机gprs连接，让手机能连接到蜂窝网络。-Mobile phone GPRS connection, let mobile phone can connect to cellular networks.

GPRSLib allows to establish PPP connection for following mobile network operators: Megafon, MTS, Beeline, Rostelecom. It keeps PPP connection alive