Mobile Odin is an application for your phone that is similar to the desktop application Odin that can be used for flashing firmware on your phone. It can be used for installing all of the various types of files that you would normally flash using Heimdall or Odin.
I went tested flashing a modem.bin file, and everything worked perfectly. This is pretty handy since 99% of the time I need to flash something using my PC, it is a modem file.
Head over to the XDA thread for more info and support questions.
Also the PRO version can be found on the Google Play Store.