Hi, sir.
I have read your requirement carefully
I am a iPhone/iPad and Android developer and your project is very interesting for me.
My ability is just suitable for your job.
I'm growing iso and android app development and I have enough experience using several framework such as GPS, Google API, Urban Airship, Push Notification and so on.
It would be important for me to prove my ability through real project.
I hope this project would be the first step in long term partnership with you.
I await your favorable reply with interest.
I feel confident my execution of this order will be to your complete satisfaction.
Best Regards.
xian