I accidently discovered a very cool way to still play with my phone when I don’t have any signal. You can try this simply by putting your android phone in Airplane Mode.
Once you have no signal all you have to do is load up the chrome browser to any website. You will then see the little dinosaur “You are offline” message.
Click on the dinosaur. He will start running and when you touch the screen he will jump. you just have to jump over the cactus and miss the pterodactyl.
Pretty sweet accidental find! I knew I liked that dinosaur for some reason…