One phone and two people is enough for a proper game. Look for these three kinds, and the waiting room becomes a rematch.
Pass-and-play board and card games
Where to find it: The App Store or Google Play, search the game's name with "pass and play"
Chess, checkers, dominoes and many card games offer a pass-and-play mode, also called hotseat: each player takes a turn, then hands the phone across.
Split-screen tabletop games
Where to find it: Lay the phone flat on the table between you
Air hockey, reaction games and simple sports games split the screen in two, one half per player, so you both play at once.
Word and trivia games with a two-player mode
Where to find it: The game's mode menu, local or two players
Word builders and quiz games often keep a local two-player mode beside their online one, which also means they work with no signal.
