What was the worst Android phone you ever owned?

We've seen posts on which Android phone was the best and which one you owned first. Now I'm asking, what was the worst Android phone you ever had? Why? How long did you have it before you got rid of it?

Note:

The device can only be one that you personally have used yourself, not what you think was the worst device based on a few minutes of use, or from what you've heard about it.