I will be getting rid of my internet service but I do need a phone and the iphone happens to have internet access. Before I buy one though I do have some questions. 1. When I was looking at the iphone today I couldn't find a firewall on it. Does the iphone have a firewall? If it doesn't should I get one for it if I can? 2. I would like to do some online purchasing and finances on my iphone. Would it be safe to do so on the iphone? Would anyone be able to get my information since a phone is sending it out? 3. Do I need a computer to set my iphone up? Can it safely be setup and used without connecting it to the computer? 4. Can I set a different ringtone for each person that calls? 5. If you've had the iphone serviced how was your experience? Did they give you an easy time or a hard time? 6. The person who waited on me said that there were a ton of free apps offered by Apple and others. Any good ones you could recommend? 7. Have you had any problems with your iphone? Has it just quit working? Any notorious issues I should be aware of?