Removing Carrier File from iPhone

Hi Guys,

I've tried searching the forum but nothing is popping out at me on this one. I'm considering moving mobile operator here in Ireland and I currently have the Vodafone Carrier file installed on the phone. The network (Meteor) that i'm considering moving to does not have the iPhone as one of their phones and i was worried about the carrier file playing a part.

I don't know if I have a new SIM card in the phone will it notice it is not the same as the carrier file and open up the settings option to allow me to to edit the MMS/3G settings etc. Or how would I go about removing it. (Hopefully it's not a factory default restore!!!)

Any advice would be great. Thanks

Richard