From the UIDevice class:
Swift version:
UIDevice.current.name
Objective-C version:
[[UIDevice currentDevice] name];
The UIDevice is a class that provides
information about the iPhone or iPod
Touch device.Some of the information provided by
UIDevice is static, such as device
name or system version.
source: http://servin.com/iphone/uidevice/iPhone-UIDevice.html
Offical Documentation: Apple Developer Documentation > UIDevice Class Reference