Need help finding original carrier *Canada* (read a lot on subject)

[miscin123]

So Im from canada and bought a used iphone locally and I know for a fact it's not rogers, so I guess im now stuck with bell, telus or fido.

Is there a way for me to find which is the originial carrier without buying a new sim card for every carrier?

 

[Moi un Mouton]

Look in Settings - General - Network - Cellular Data and see which carrier's APN is referenced there.

 

[miscin123]

Look in Settings - General - Network - Cellular Data and see which carrier's APN is referenced there.

I don't even get the option to click cellular data, it doesn't exist.