Since the DoublePlay uses the older Android 2.3 Gingerbread operating system, you won't find any of the new and improved contact management tricks of Android 4.0 Ice Cream Sandwich. For example, when a call comes in, there isn't a slider that lets you send the caller a text message instead.
Despite an antiquated interface, the phone was loud and clear for most test calls, and the speakerphone was plenty loud.
The DoublePlay has the dreaded "taco phone" look when you make calls, due to the larger size and thickness. Imagine talking on the Nintendo DS as a phone and you will get the idea.
We did like the quick responsiveness for searching contacts. You can press the search button to type a name, and once you do, a list of contacts and saved e-mail addresses appears almost instantaneously.
With a few other phones we've tested, including the Galaxy Nexus, there is sometimes a slight pause when searching. The Contacts app tended to load a bit slow, probably due to having 3000 Gmail contacts.
For each contact, you can view the history of your interactions. The phone also lets you add Twitter, Facebook, and other contacts for social networks and search for those as well.