1. Extended warranties/phone insurance
Extended warranties for computers and electronics can add hundreds of dollars to the price of your purchase. And they're usually bad investments.
The basic manufacturer warranty on most gadgets typically covers a year of use, which is when repairs are most often needed. Extended warranties will bring that out to two or three years, but by then most gadgets are outdated and not worth repairing.
The exception would be an expensive computer that you carry around, like a MacBook.Click here for more pros and cons of Apple's AppleCare.
If nightmares of dropping your smartphone keep you up at night, you can buy yourself peace of mind by self-insuring. Put what you would have spent on protection into a savings account.