All a SIM card does with an iPhone is provide information used by your telephone company to add service ot your phone. It has nothing to do with anything Apple does so Apple does not provide them. The exception is if you buy an iPhone in an Apple Store and they work with a carrier to provide service on it immediately. Still, even then they are really doing it for the other company and I seriously doubt they can provide a replacement card since their service is designed for providing new accounts, not general phone service support.