ARMv8 / ARM64 = iPhone 5s
ARMv7s = iPhone 5, iPhone 5c, iPad 4
ARMv7 = iPhone 3GS, iPhone 4, iPhone 4S, iPod 3G/4G/5G, iPad, iPad 2, iPad 3, iPad Mini
ARMv6 = iPhone, iPhone 3G, iPod 1G/2G
iOS 4.3+ requires ARMv7. If your Deployment Target is 4.3