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I'm not sure if this helps, but I think Google Voice is still unavailable to 95% of the world (i.e., it's Americans-only) so that may be a large difference (if these guys support non-Americans, anyway).

Ah, I always forget my American privilege. You're right of course.

One difference (relevant to me, at least) is that Google Voice does not yet support MMS messages.

On Sprint it does

It's a bit of a hack, you only see photos if you enable text to email and read it as such.

I believe mightytext has actually been around longer than koush's DeskSMS.

Whoops, I tend to assume a feature on TC indicates a recentish launch.