I once teased an American friend about the fact that only 36% of Americans hold a passport, compared to 83% of Brits. He quite rightly pointed out that in America you can fly for six hours and still be in the same country – Seattle to Miami, for example – while Brits can fly for an hour or so and be in any one of a dozen different countries. (I later did a bit of Googling and found he could even have said 11 hours: New York to Honolulu.)
For that reason, this feature request may be most relevant to Europeans and frequent business travellers, but I think it’s one that would at least fall into the nice-to-have category for anyone who travels.
The issue is mobile roaming charges. Use your iPhone in your own country and all-you-can-eat calls and texts are typically pretty affordable, with data being the main thing that determines how much you pay for your plan. But however much you pay for data at home, that’s nothing compared to roaming charges ove