I’m in the USA with AT&T. I have an ( iPhone 2G with AT&T ) & (iPad WiFi + 3G & NOT JAILBROKEN). Yes the iPhone is “original iPhone” BUT all 2G iPhones have AT&T UNLIMITED data plan.
When the iPad 3G came out, if you wanted 3G connections when there was no WiFi available, AT&T charged $$$ for a month-by-month iPad 3G DATA plan. There WAS a way around this iPad $$$ data charge by swapping your iPhone SIM card and putting it in the iPad ( IF ) your iPad was still on OS 3.2.x.
With AT&T, the iPhone APN name is “phone” & the iPad APN name is “broadband”. If you removed the SIM card from the iPhone 2G & cut it down to the iPad “mini-size” (google to see see how easy), put it into the iPad SIM tray then go to settings > cellular data, and change the iPad APN name FROM “broadband” TO “phone” then restart and you now had UNLIMITED 3G data on your iPAD.
BUT - “No good deed goes unpunished” !!!
When Apple updated the iPAD to OS 4.2.1 they “hid and/or removed access” to the iPAD’s APN setting thereby making it impossible to change APN names on the iPAD.
There a many methods to access the “hidden” APN settings on an iPHONE - but does anyone know a method now to access the “hidden” APN setting on an iPAD running 4.2.1????