How can i get a VPN through a firewall?

If they are blocking and they are worth their salaries then there isn't. At least not on an iphone and not without jailbreaking it.

The only option would be a VPN over SSL on a commonly used port (like 443) - something like OpenVPN

It's interesting how some people want to know how to bypass something, and not know the repercussions, for bypassing it. The question you should be asking is how to bypass a firewall, and not how to get a VPN through a firewall. If you can't bypass a firewall, then someone will notice your clumsy attempts, and you will be caught.

Try to image what will happen to your entire future, and now I cough. Because you won't have one if someone catches you in the act. There are consequences, for behaving in this manner, and the consequences are severe.

Unfortunately if your not a penetration tester, or hacker, then you won't be able to figure out how to bypass a firewall. You might as well use internet with a VPN somewhere else.

You are incorrect in being "sure there is a way to bypass" the firewall Commercial firewalls are a lot smarter than most people, and schemes to get around them. They can detect VPN use on their own, and thus block or blacklist the VPN site automatically.

There is absolutely no way around a firewall that can detect VPN use, unless you can hack the firewall itself (not likely you can do it, else you would not be asking this question here on YA...)