Reply #4: True of any WiFi portable. Just use common sense. It has an alternative network to WiFi.

[onehandle]

The iPhone can use AT&Ts EDGE network and switch off WiFi in public. Anyway, in these situations, the odds of this happening to an individual are always pretty remote. Gotta have just the right expert there waiting for you.

From article:

Mr. Rubin said, “I will think twice before getting on a random public WiFi network now (common sense for any portable computer),” but his overall opinion of the phone has not changed.

“You’d have to pry it out of my cold, dead hands to get it away from me,” he said.