Advice for Teleoperation of a Robot

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You will need both port forwarding and robotwebtools if you plan to make the interface a web browser. You don't say in your question how you are doing it today but I'll assume you're using the standard route of having ROS on multiple machines and using standard pub/sub.

If you plan to have the remote machine running ROS and controlling same as now, I think you'll find a VPN in your future but I have zero understanding of how that will work so will not comment further.

If you do not plan to have ROS running on remote machine, then rosbridge, robotwebtools and portforwarding will be required.

As you note, robotwebtools is how to interface using browser. The robotwebtools site example codes includes a telop example so much of the work has been for you, but the last time I looked at that site the code had some dead links (URL to libraries that no longer work). You'll also find that getting telop to run on an iPhone will be very difficult as iOS will not present a keyboard unless there is a textbox open. When I started the same thing you're trying I gave up on the keyboard based telop and instead created a click-a-button based code for "telop"ing. If you're planning on remote machine being a PC with keyboard, then you're probably OK. But if control via a phone is required, you should not plan on a keyboard input method.

You'll need to use and understand rosbridge, robotwebtools, apache, HTML, and at least a little about how networks work.

I cannot help you with your portforwarding issue. You haven't provided any info on your network (school, work, home, port 80 blocked, intermediate firewalls, etc).

If you tell me you're not working on a homework assignment I can provide the HTML code for my page that allows for driving robot around clicking on buttons on webpage with camera streaming video.

EDIT after follow on questions:

1 - see below for HTML code that worked on my set up. This code resides on the robot computer and is accessed through the page being served by Apache that is also running on the robot computer.

2 - Google tells me that port forwarding can be setup on those air cards. You'll need to port 80 and 8080 and 9090 I think(can't remember for sure) to run the code below. The air card that needs the port forwarding is the one that supports the robot, not the one being used by remote. You need to know the ip address for the aircard supporting the robot and route ports specially to the IP address of the robot on the wifi network.

3 - As I noted in the original answer, if you plan to run ROS on remote machine I cannot help you. I think you need VPN for that. I don't know anything about VPN(never tried). My ... (more)