StreakSmart - Yes, you read that right. The Dell Streak 7 has hidden phone functions and can sort of make calls.
That's the secret phone app you're looking at above. It's nothing fancy because the UI either isn't enabled or simply isn't in the system, but a dialer from whatever keyboard you're using will appear when you tap the bar below the Tablet, Call log, Contacts, and Favorites tabs at the top and let you input a phone number. Dashes are automatically inserted too.