Thanks for the help in advance. (◕‿◕✿)
Will a sim from iphone 4 fit in iphone 5?
No it won't. The sim for Iphone 5 is smaller than that for Iphone 4.
iPhone 4 - microSIM
iPhone 5 - nanoSIM
Generally the SIMS are not interchangeable between iPhones and other phones, or iPhones and different model iPhones.
I don't think it's that SIMple