Noblesse Phones are customized phones that are used by the Selecao.
Noblesse Phones are specialized phones made by Saizo Ato from Ato Institutes. Their main functions are to assist the Selecao with their overall task of saving Japan in any way they see fit. From a normal perspective, it is a high grade phone that functions just as any other cell phone would. However, as Juiz points out, each phone is fingerprint locked so that only the assigned Selecao member can use it. (For example, Yusei Kondo tried to steal Akira Takizawa's phone and found he couldn't use it because of this). It is also a self-running phone as it is noted that there is no way to charge it.
The way that the Noblesse phone differs from other cell phones is that each phone is specialized for each of the twelve Selecao. Each phone contains a balance of 10 billion yen for the user to do what he wants with it to help Japan. They are different colors and have different numbers on the back to correspond with the unique user. The round justice symbol on the other side of the number pad can be used to call Juiz by simply pressing it. By doing this, they may be able to obtain information or make a purchase through Juiz. The phone also keeps tabs on the other members of the Selecao through their bank statements so that the Supporter could monitor their activities and to keep the Supporter's identity a secret. At the top of the screen are symbols that represent the members of the Selecao. When one goes dark, it means someone has been eliminated and no longer playing the game.