[yock]

At least two of the three most prominent smart phone roms are backed by operating systems that have long histories of (more or less successful) profile switching. It might in fact be a difficult problem, but it's one that has serviceable solutions and has for some time.

[mechanical_fish]

No, difficult for the users, not the operating systems.

Operating systems have had user switching for years. But I'll bet only a small minority of Mac users even know this is possible, and even fewer have ever used it.

[jxi]

What's the third? Blackberry or wp7?