How Does a Mobile Phone Access the Internet? How Does 3G Establish a TCP Connection? How Does 3G Establish an HTTP Connection?

Best answer from Zhihu:

http://www.zhihujingxuan.com/23124.html

TCP Connection, HTTP Connection, and Socket Connection

http://www.blogjava.net/thisliy/archive/2009/11/08/301615.html

Socket Communication Between Android Client and Server Based on TCP/IP Protocol

http://blog.csdn.net/ryantang03/article/details/8274517

Embedded CDMA Wireless Terminal with TCP/IP Protocol

http://www.ednchina.com/ART_24871_29_20027_AN_57a2cee9.HTM