Far from it. If Apple has an off-switch for any potential competitor to AT&T, which any VoIP provider is, then the only way for another VoIP provider to take on

Far from it. If Apple has an off-switch for any potential competitor to AT&T, which any VoIP provider is, then the only way for another VoIP provider to take on Skype on the iPhone is to have enough market share outside of the iPOS garden to make it too costly for Apple to hit the kill switch.