The '- +' modular phone isn't just a phone with a bunch of parts that come off and don't do much. This phone and all its different parts will all work independently, giving the user the right tool to use whenever they need it. Much like LEGO blocks, the phone can come together and come apart simply by pulling it apart and building it back up.
The cool thing about the phone is definitely that you can easily pull it apart and use each piece by itself and there's a genius idea behind this. The thing about the way phones are now is that often companies nickel and dime customers by adding small features to phones. With the - + phone, these small features can simply be added on like more LEGO.