Recently, I had a large surcharge added to my cell charges because I was using "cellular data." The thing is, I never do that - I have cheaper ways to obtain internet services. My wife checked out the setting (I "inherited" the phone from her) and the service was in fact on, but I had never turned it on, and the procedure seems too complicated (three screens) to happen accidentally. It could not have been on the entire time I had the phone, or the charges would have been astronomical instead of merely excessive.
I'm curious as to whether such a service can be turned on remotely.