The iPhone 4s just went on sale last Friday, and already some of the people lucky enough to get their hands on it are complaining.

Sure, they love the new Siri voice-command service that can seemingly do everything -- except give us a pedicure. (We’re still waiting for that). But there appears to be something a little off with the color scheme.

CNET reports that owners say the 4S screen has a yellow tinge, especially the black models. Some say the glue used to put the screens together could be to blame, and it’s a problem Apple has seen in the past. Apple says it sold more than four million 4S phones on its debut weekend, and that you now need a reservation to get one.

Check out the "How to Buy" page from the Apple website.

Meantime, the latest rumors say the iPhone 5 -- which was the last project of Apple’s late co-founder, Steve Jobs -- may be released next summer. As with all things iPhone, it's a big maybe.

We just hope the iPhone 5 has the pedicure feature.