You already updated the IOS version of the phone to IOS7 and the facebook version to 6.5 right?
May I ask was it working properly besides from the error that you received ?
Considering the fact that you have Unlisurf service. For me there is nothing to worry about that. Since the Unlisurf service will cover all the data charges that you made. What bothers me is that can you use the facebook application?
I can't use the app at all. I'm just getting this http://imgur.com/F7o4pWG and when I click the link 'Go to Facebook Mobile site...' it will be directed to the same page. Already contacted Facebook, stil jo response from them. I think my internet profile is set to unlifacebook only by facebook whenever I'm using my facebook app. Really not sure how to fix this.