As someone who doesn't own a smart phone (witch! Burn the witch!), what, exactly, is jailbreaking and the associated ethical concerns?
Well, speaking with regard to jailbreaking of iPhones, one has to understand that in their factory state, iPhones and other iOS devices can only download apps through iTunes, these apps go through an approval process, so apps with objectionable content rarely make it. Moreover, these devices have a somewhat limited functionality (For example, the bluetooth abilities of the iPad absolutely suck because the bluetooth stack doesnt allow for enough external devices).
The iPhone-Dev team, a group of programmers decided to mod the iPhone by finding exploits in the basic architecture of the device's firmware, allowing for the restrictions on the device to be removed (which allows us for installation of Cydia, the alternative app store where anyone can submit an app regardless of content), moreover, jailbreaking has opened up the ability for individuals to mod their devices with new themes, extended functionality (such as the use of an external bluetooth GPS for the wifi only devices, as is the case with BTstack).
In the beginning, there were questions surrounding the legality of jailbreaking. Soon after, the Supreme Court, in a suit filed by Apple ruled that jailbreaking of iOS devices was legal. However, Apple soon retorted with a statement that all users who jailbreak will have voided their warranties (which really isnt a problem since all you have to do is a device restore and Apple will never know).
I won't get in to how paid apps can be downloaded for free via jailbreaking, because that is one of the main reasons ffemt doesn't want this site involved with any endorsements of jailbreaking by its users as it still constitutes the theft of an individual or company's intellectual property, which is protected by law. So after having a discussion about it with ffemt (because someone had asked me before and I was kind of confused on how to address the issue on the forum), we decided that it was best for me to not show people things like how to jailbreak on the forum.