The fastest and easiest way to disable the EDGE network~!!

hi~ everyone~

the topic may be solved by someone before~ or someone may have provided the same solution as mine~
Anyway, I think I just successfully DISABLE the EDGE network~
so, I wanna share with the others who are facing this problem~

To me, the fastest and easiest way to DISABLE the EDGE network is:

CALL your wireless company's customer services NOW~!! (in my case, ATT/cingular, just dail 611 from your phone) and tell the rep. you would like to have them block your phone from the EDGE/GPS service ; be patient to explain your situation and request the person to block the EDGE network/service for you.
If the company disable your EDGE network, the "E" icon on your iPhone will disappear after you reboot the phone. To re-confirm, I suggest you, after reboot the phone, to
1. "reset the statistics" under the "Usage" menu; so, your network data's "Sent" and "REC'v" will be back to 0.
2. turn off the Wi-Fi and see if you can access the internet; if you get a message like "could not activate the cellcular network") , then it means the EDGE is blocked by your wireless company.
3. now, turn on your iPhone's WiFi, and go to any sites you want, like youtube.
4. go back to check your the "Data Sent & rec'v", if they are 0~ then it means you now only access the internet via WiFi, and the EDGE is disabled now.

I've been spending a day to search over the internet for a viable solution, but some tells me to run SSH to configure the iPhone in a technical level; some told me I can turn off the EDGE network at "Setting" menu; anyway both methods didn't work for my iPhone. (I didn't try the openSSH one, coz' I don't wanna bare any risk, BUT , there are some guys can REALLY disable EDGE in that way.so~)

Hope this help~
if the info I provided is wrong, pls~ address me~ thankS~!!

Dani~