NEW , 2010 solution 5 Steps to disable & stop iPhone / iPad 3Gs 3g/ GPRS/ Edge data charges
For iPhone with new firmware (3.0 & above) old 2009 methods may not work anymore. Disable3G.com have come out a PAID services to ease your pain of paying uninvited, unwanted 3G / EDGE / GPRSdata charges at usd$ 4.75 
compare to many other solution i found before eg iPhonenodata, BossPrefs etc, this one seem to be the most user-friendly. for review HERE.
2010 solution 5 Steps to disable & stop iPhone / iPad 3Gs 3g/ GPRS/ Edge data chargesby STEP BY STEP
1. log on to www.disable3g.com
2. paid USD$4.95 & get the GOD damn access code
3. from iPhone 3Gs safari log on to www.disable3g.com
4. enter your access code
5.click disable EDGE/ 3G
6. click INSTALL to get the iPhone 3Gs DISABLE EDGE/ 3G Profile install
7. Click INTALL NOW to confirm iPhone 3Gs EDGE/ GPRS DISABLE Profile installation
8. DONE ! Just restart your iPhone 3Gs . Thats is it
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