The people siding with AT&T on this, thinking Apple will take T-Mobile to court to "protect their profits" need to consider two things:
1. There is a limited number of folks who are willing to go through the trouble of hacking the iPhone to unlock it - and even if that weren't the case, the group of people putting in the time and effort (or putting up the big bucks on eBay) for unlocked iPhones are obviously people who have NO INTENTION of signing up with AT&T, ever. In other words, it isn't lost revenue for Apple, it's gained revenue from someone who'd otherwise be on T-Mobile with a non-Apple phone.
2. That being said, this is no different than Apple themselves releasing the iPod Touch. I think that's a bigger source of lost revenue in the AT&T/APple partnership than the iPhone unlock is...
1. There is a limited number of folks who are willing to go through the trouble of hacking the iPhone to unlock it - and even if that weren't the case, the group of people putting in the time and effort (or putting up the big bucks on eBay) for unlocked iPhones are obviously people who have NO INTENTION of signing up with AT&T, ever. In other words, it isn't lost revenue for Apple, it's gained revenue from someone who'd otherwise be on T-Mobile with a non-Apple phone.
2. That being said, this is no different than Apple themselves releasing the iPod Touch. I think that's a bigger source of lost revenue in the AT&T/APple partnership than the iPhone unlock is...