Poor iPhone video output from QT Pro

I am creating videos for my website using the File > Export for Web option in QuickTime Pro.
My problem is with the generated file for the iPhone "myfile-iPhone-cell.3gp". The video generated for the iPhone is very poor quality - it is very pixelated when streamed over the internet. I believe this is due to the fact that it is generated by QuickTime Pro at 176x109px, which is about 1/2 the size of the iPhone's actual screen. So, when it gets to the iPhone, it has to be "enlarged" and then gets grainy. If I stream a large dimension MP4 file, like 640x480px (from another software converter) into my iPhone, it looks really great.
So, I'm wondering why the programmers at Apple, who have direct access to the hardware and software, chose to output the iPhone-cell.3gp file at such a small dimension? Is there a way to correct this or am I stuck with what I get? I feel the video quality is not good enough to put on our corporate website.
Any advice on this is appreciated. Thanks.

The cell type movies are meant for ten-year old Nokias.
I feel the video quality is not good enough to put on our corporate website.
Then don't post it. Or enlarge it.
Use a larger export size. The iPhone type. It's for the iPhone: myfile-iPhone.m4v
It's not difficult to figure that out. And you seem to know the answer:
If I stream a large dimension MP4 file, like 640x480px (from another software converter) into my iPhone, it looks really great.
And why not try them all. Why not try? Why so helpless?

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