I agree with you that Milgram’s experiment was completely unethical. There is no way the participants could have protected or prepared themselves for that situation; whereas Zimbardo’s participants at least were informed that (before it went south) they were participating in a role-playing simulation, so they might differentiate between the experiment and reality more easily.
I like your idea on cell phones and their effect on relationships! I grew up in the middle of nowhere where the only effective method of communicating with friends would be to ride your bike a mile to the neighbor’s house and knock on the door. It’s very rare to see that anymore, when it requires so much less thought and effort to text ‘hello.’ I have found in my own relationships that it is extremely hard to carry a conversation with someone because they have been distracted by their phones.