Hello mate, I just read through the job details extremely carefully and I am absolutely sure that I can help you to fulfill your expectations.
Actually, you want to make a phone application where user can login with their Facebook account.
Here will be a authentication system where user will submit login credential and after authentication it will redirect to proper space.
It is pretty easy job for me. I can achieve the results that you are asking for.
But I want to know more in details. Please contact me to provide me some more details about the project scope.
I am an experienced Web and Software developer from last 3 years in an organization. So, I have a very strong knowledge about development applications and websites. My strong parts are CUSTOM PHP-MySQL, WordPress, Jquery-AJAX, HTML5-CSS3, Bootstrap, Code Igniter and Phone gap. I have worked across all areas in web site development and Application Development.
I am requesting only that you first check our ability, then approved us.
No need to pay anything advanced.
Thanks and especting your positive replay.
Regards.