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The problem with using a cell phone is that the data mode will not work when you are roaming (at least this is how it works with Sprint). He will probably be roaming for some of the bus ride.

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I've done 100 mile trips with the cell before with no problems. I do have Verizon though. I do not have nationwide unlimited plan or anything like that, so I was roaming. I noticed that if I initiated the connection near my house, and played for a few hours (150 miles or so), I didn't get roaming charges. This was over a year ago so it may have changed.