Facebook Page Default Tab on Mobile Version

Unfortunately, mobile version Facebook do not support default tab landing on a fb application. I have performed a workaround method.

Workflow on full function Facebook (Desktop / Laptop)
1. New fans visits our page, will be landed on a Special Promotion Tab application.
2. Like us, and then redirected to a questionnaire form and fill in a simple questionnaire.
All the thins worked perfectly on this version.

Mobile Version problem
New fans visits our page, will be landed at wall but not on the Special Promotion tab application. This is what we are upset and seems no options or setting can be done on facebook page.

Workaround solutions
1. We shared a link on page Wall, for both not liked or liked fans.
2. The link put some logic, if detected it's a mobile version then will check the guest liked us or not. If not liked, then will show the promotion page. If liked, it will redirect to questionnaire form. (Since, we are started at Page wall so the link we did must be a popup windows; it still a way can do the same effect.)

Good Luck!