I bought an iPhone 3GS for a friend who's a n00b. He doesn't even have a computer. So being able to access the Net on his phone is a big thing for him. He got the 200 mb plan from AT&T. I showed him how the phone works. That was two days ago. He called me today to say that his usage was at nearly 400 mb. I asked him what the heck he had been doing, like watching YouTube for 48 hours straight. He said he watched a few videos, but nothing else. I find it hard to believe that he could have burned through that much data in such a short time by watching "a few videos." Are there any other hidden data suckers on an iPhone? Does Location Services use data? I watch a few videos from time to time, but my data usage usually runs about 400 mb for the entire month!