Can I still use a iphone with buying a sim card from a store and not a cellular service?

I'm buying a iphone 6 from amazon but not thinking of connecting it to a cellular service. I know I need a sim card to use it like (taking pictures, downloading apps, imessaging) . Is it possible to buy a iphone sim card from best buys to be able to use the iphone?

Yes, you can and get it unlocked to use any sim card in it and in case you need a good security app you can have Leo Privacy Guard, it will solve all your problems.