Every time I choose my vault the game starts loading then crashes. Is there anyway to fix this?

Am on iPhone 4s

What devices is Fallout Shelter compatible with?

Answer: Fallout Shelter is for the iPhone 5 and up, the iPad 3 and up, and the iPad Mini 2 and up. It is optimized for the iPhone 6, 6+, and iPad Air 2. The game runs on iOS 7 and up.

Devices with 512 MB of RAM are not supported. This includes the iPhone 4s, iPod Touch Gen 5, iPad 2, iPad Mini Gen 1.