Mobile position detecting by cell information

position by cellid and LAC
google has api

sina may have

a site for query by form : http://www.cellid.cn/index.php

an article to get more accuate positon: http://wenku.baidu.com/view/d1272af49e3143323968935d.html

get cellid and LAC
http://www.jouhu.com/blog/?p=1950

all list methods are basically invalid.

unexported method of  CoreTelephony.framework : apple won't approve

AT commands : can't run without modification system file, and it doesn't work in 3G


 * 3001#12345#* : it is in its own window.

some sample code to do similar thing, (not sure what is used)

https://github.com/valexa/VAFieldTest

Apple
Apple offers Significant-Change Location Service

it is basically the location awareness with a special starting method, but you have to enable location awareness in system to use it.

http://developer.apple.com/library/ios/#documentation/UserExperience/Conceptual/LocationAwarenessPG/CoreLocation/CoreLocation.html