There's a very REAL way to combine those three, but it depends on how much technological tinkering you're willing to do. I've been doing this for a while to access Metatrader while I'm in a different area of the house or my office, but I've been thinking very seriously about setting up a dedicated server so I can access it from anywhere with iPhone. Here's how to do it:
**START with a Jailbroken iPhone which has Installer.app on it. You can Jailbreak 1.1.1, 1.1.2, or 1.1.3 versions (search online for instructions). This is the hardest step, and can take quite a while to get it right, but once you're jailbroken it's golden... Once Installer.app is installed, you need to download VNSea.app for iPhone. This will allow you to log in to your desktop machine remotely and perform actions as if you were sitting in front of the computer.*** This is the step where you have to decide whether it's worth the potential risk of ruining your iPhone, and possibly violating the Apple iPhone End User License Agreement (I refuse to accept any moral responsibility for the consequences of your actions; please check with your attorney and/or clergyman if necessary). While jailbreaking, I've run into several instances where my phone was supposedly "bricked" but I've never had any problems restoring my iPhone to factory-fresh firmware and full functionality after failed attempts to jailbreak. Personally, I didn't let the fear hold me back and it paid off...
1. Mac at home with always-on internet and dedicated I.P. address (work with ISP to get your dedicated I.P. address set up).
2. Set up a free VNC server with password (I use Vine Server on Mac, but there are many Windows versions out there). This allows you to log in from your iPhone using the VNSea.app client.
3. Of course since I'm on a Mac, I have to use Parallels to open Windows and launch MetaTrader.
After all that, simply open VNSea.app on your iPhone, enter your I.P. address and password. Once you're logged in, you can click, right-click, hold down option/alt/ctrl/shift keys, do CTRL-ALT-DELETE, access all F1-F12 keys, click-and-drag, and other stuff. It's really really awesome how functional it is. You can even draw trendlines and Fibo levels with pretty good accuracy using your finger! Place orders, analyze charts, run EAs, and do basically everything you can do from your desk!! Once the iPhone SDK is out and they re-release VNSea.app for sale, I will buy a license and put some good food in the developer's stomach.