The little blue sign means that your device cannot open Flash.

VOA: special.2010.06.22

We don't mind making it painful for users to sign into their device if they only have to do it once.

ENGADGET

The only notable change is an articulating, telescoping antenna that screws into the top of the phone -- a sure sign that this device is nothing but a trial unit since we'd assume retail devices would have a sexier way to stow it.

ENGADGET: Samsung's Mobile DTV-enabled Moment hands-on Hands-on

One big sign is that your device starts acting strangely.

FORBES: Your Phone Has Been Hacked. Here's What You Need to Know.