Well, honestly, the thing that will usually hold you back the most is bandwidth as far as LogMeIn on the iPhone. AT&T is hit or miss on this, depending on where you live. For screen size, it is difficult to use something like the iPhone for using a program with a resolution that is larger than the screen, such as Amazing Charts. Most people have a laptop, I would suggest tethering as a better option than using the iPhone for ease-of-use or finding a wireless hotspot if you need a speedy connection.
