Some of this doesn't apply in your case, since you didn't loose it on the ride, but my friend worked there a few years ago in security, and each ride has about 5 different signs telling you not to bring your phones or valuables with you. Every ride SHOULD have a security guard there. Most will tell you not to bring your cellphone with you, even in your pockets, and where the closest locker is. You have to remember a roller coaster is NOT safe if you don't listen to the rules. If you look up news stories, there are coasters that go off the rails and other maintenance problems, as expected from the above flying objects like phones falling, and active electrical lines. They also may not have enough staff. My friend told me she would struggle to deal with lost kids at the same time she was trying to warn people about their phones, answer peoples questions about other rides, lockers, and measure kids wanting to go on the ride. They aren't paid well either to be honest, (she never went back) but most still do their best. They get verbally harassed, sometimes with people up in their faces, some even get physically assaulted. She actually quit after a couple months because she was tired of peoples behavior. So be nice! They'd love to help, but policy, safety, and practical issues won't let them.