HTTP Not Redirect TO HTTPS

Hello All,

We did configure port redirection on firewall and configured IIS as follows:

1- HTTPS Redirect : Redirect requests to this destination (HTTPS://mail.contoso.com/owa in IIS ).

2- Redirect Behavior ( Redirect all requests to exact destination ) 

3- Status Code (302)

Now if i type HTTP://mail.contoso.com/owa through desktop browser then it will be redirect from HTTP to HTTPS, but if i try to logon through i phone, then i cant ( no direction). 

Is there is any extra configuration i should do.

( In Redirect Behavior, if i select "only redirect requests to content in this directory", when i wont redirect to HTTPS through desktop.

Regards,