You must first login into your Gmail account. In the upper right hand corner you will see a link to "Settings". Click on that link. On the settings page, click on the "Filters" tab then you will see a set of text boxes that you can fill in. Put the email of who you like to have forwarded to your mobile phone in the "From" box and click "Next". On the next page, put a check next to the box that says "Forward it to:" and type the email address you want the messages sent to. Finally click "Create Filter" and you are done!