Ya, 1D codes are tough to do on phones that don't have macro lenses because of the fine bar-space patterns in most 1D codes - the bars and spaces get blurred together.
2D codes like QR Code, DataMatrix, etc. typically are easier because they have larger modules, plus they have error correction built into the symbologies, which allows you to survive a less-than-perfect read.
The NeoMedia reader mentioned doesn't actually succeed at doing most 1D codes except in the most extreme and lucky circumstances. Their original app description was a bit misleading in that respect.
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