Sim Card Swapping

hey guys, i couldnt find any information on this…

My mom has a iPad 2 micro sim card with ChungHwa Telecom. I recently upgraded her US phone to an iPhone 4S and its currently unlocked.
I realize that she travels a lot so i told her she can swap her iPad 2 sim card into the iPhone 4s and just use data. But i was reading in the US that ATT can detect if the device your using is an iPhone or iPad and will automatically upgrade an data only sim to an iPhone plan.

Does anyone know if that will happen on ChungHwa Telecom if i plug in the the iPad 2 sim card into the iPhone 4s, will it upgrade it?
TIA!