T-Mobile has had this quite a bit longer. No doubt Verizon will use the "national carrier" line to claim the distinction ...
That being said, an obvious question comes to mind (which, alas, I'm not in a position to check on) :
Since the ringback is specially generated, does the call get "supervised" as soon as the caller first hears the ringing?
Similarly, what happens if the recipient doesn't answer but just lets the ringing continue (most specifically _not_ counting a kickover to voice-mail).
Anyone know? I don't have any friends who've signed up for this sillines so can't check things myself.
( minor disclosure: shareholder in Omnipoint)
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