MyCokeRewards Delivers Unrewarding Mobile Experience
You may have seen the red caps on coke bottles.

If you looked closely, the caps instruct you to log into MyCokeRewards.com and enter the number printed on the inside of the cap. Doing so will accrue points that you can exchange for wonderful goodies.
Going to the site yields this screen:

Unless you’re on a mobile device, like an iPhone:

Now, what are the odds that people drinking coke would be closer to their phone than their PC? Probably pretty good.
A great example of how the designers haven’t taken the user’s context into account.
Published here on October 4, 2008.