Hi. Anyone here knows an App or function that allows 1-press and turns off all 3G, WiFi & Cellular Data? Press 1-time again and all this go back on (if can customize just on 3G & Cellular separate from Wi-Fi even better). Very troublesome to change settings all the time just to conserve battery.

No you cant.BIS is for Blackberry only.
You can cancel the BIS service from your service provide.
But since your line are contract signed,i think they will ask other refund or demand for that.
I assume you paying around rm50 for that BIS.try to call them and ask.
Gevey only unlock your locked base band.Where if my calculation right,in 5-10months there wont be any unlocking tools or hardware requires for iPhone.
If you get me what im saying,just