Can you transfer SIM info without buying a new SIM?

Ok so my grandma just has this flip phone and she's on the same plan as my dad and I. My dad is paying for enough data for her to have an iphone and it can't be changed, so we figured why not let her have one of our old iphone 4's lying around. So obviously her sim card is way to big to fit into the slot on the iPhone, so i was wondering if you could transfer her sim Info to the iphone itself by like calling apple or something. We want her to be able to use the phone by like tomorrow so it would be nice if we didn't have to go to the AT&T store and buy a new smaller sim card. If anyone can help I appreciate it!

Sorry, the Sims card is a necessary chipset needed to run a phone. Some phones have it internally built but those are just really old phones. I do believe that they would just give you a new Sims card if she upgrades her service. You should give your provider a call.