Acessing the SFIV mobile site from a computer

So I’ve been trying to register my SFIV IC card, but it seems that my phone cannot access the internet somehow, and I am unable to borrow a phone for the time being. So, this leaves me with one last solution, using a computer.

However, the only thing I can think of is spoofing my user-agent to that of my phone (Sanyo A5527SA), but I’m still getting a 403 error when I try to go to

Any suggestions?