That was good. You actually made me laugh.
A 3h long phone interview? Tough. If I were an employer I'd want to interview in person, you can tell so much more about someone than on the phone.
Hyper's advice sounds best, imo. I don't think the questions will be about the "Practical Explanation about Next Life, Purpose of Human Life, philosophical/religious facts, theories etc." lmao, they'll be something like "Do you know Squirrel?" And saying "no, I don't" doesn't look very good... Do what Hyper said if you're good at that, I personally would really suck with that sort of improvisation. Have them hire you first and then you'll work extra hard to get more experience with Squirrel or whatever else they want you to know :D
I agree with what hyper said. Be prepared to do quick, additional research in between sessions; depending on how efficient the company is, you may have a substantial amount of time between interviews to review your responses.
IT groups are always more casual than they seem, so the majority of the interview will consist of the interviewers getting to know you as a person, and testing to see if you're a good fit for their team.
While competence is important, technology advances at such a rapid rate that your potential for growth, and ability to train in new hardware/software, will be more valuable to the company than any perceived incompetences in an interview (unless they're looking for a specific skillset).
If you're inexperienced in an area, mention that you're not familiar with the subject. Ask them to elaborate on the subject further, providing you useful information to work with. This not only demonstrates your curiosity and interest in the company, but also a willingness to learn and take initiative. If they then mention something that you do have experience with, you can tie the unknown to something that you do know, giving you the opportunity to overshadow your weakness with a strength.
They called an hour late. I had 13 pages of notes printed out and taped to the table, the computer screen, and the wall behind it so I felt I was ready for anything. There was 5 of them and they took turn asking me questions in rapid fire succession. It was the hardest interview I ever had. I did what Hypercube said to do when they asked something I didn't know but ran out of things to say after about 30 minutes so I started saying "I don't know". It turns out that was fine because they wanted to see if I would try to lie my way thru it. One of them was, I'm 99% sure, a really butch lesbian. She kept asking these theoretical questions that no one would ever do in practice and 2.5 hours into the interview I had enough of her. She started talking about some hypothetical situation and I interrupted her and said, in very professional terms, that what she was talking about was amazingly stupid and a gigantic security threat. She responded that she actually does what she was describing. I replied that if I saw her doing that I would lock her out of the servers and notify upper management. She got seriously butthurt and the others interrupted and the interview ended shortly after. They told me that people usually have 4 or 5 interviews so I guess I passed. I imagine I'll hear tomorrow.