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Firefox OS is the crazy new idea from firefox's community, firefox OS is a mobile operating system, like Android, which allows you to use your phone in different cool ways like install nice apps, check your e-mail, play games and stuff. The first phones with the mentioned OS will be ZTE, and the first market will be Brazil in january of 2013. There are already a lot of mobile carriers backing up the project like Deutsche Telekom, Etisalat, Smart, Sprint, Telecom Italia, Telefónica and Telenor.

You only had a few errors.  Muy bien! The two main errors were "it's" and "there is."  "It" is a pronoun, but because you had "firefox OS" as the subject pronoun you did not need to use "it."  And "there is" is singular, while "there are" is plural.  Use "there is" when you say "there is already one mobile carrier backing up the project," but "there are" when you say "there are already a lot."