Qr code issues on business cards or other small items?

I have an issue where the simple QR code on my business cards is not being read. I think I know the answer but I would like some clarification so I can make the correct changes.
The square is a little less than 1'X1' my 3G Iphone won't read it, but will read other sizes fine.
Is this too small? Is it my phone's camera?
Also, there's a glittery finish on my cards and I'm thinking the texture isn't helping.
I'm designing my cards myself so I can make adjustments. There's a little bit of wiggle room if I need to make the square a bit larger. I don't want to have to go too large so the square overwhelms the whole card.
Any input will be extremely helpful. I'm going to try and make a jpg I can upload with the shiny finish.

The more complex the code, the larger it should be.vCards are notorious for having a lot of information, so the larger the better.

Try this site out:

http://cardswapp.com/

You may even want to consider putting a larger QR code on the flipside of the business card. Larger is better.
1.5 x 1.5 (85% success)
2 x 2 (100% success)

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