How do you get an iPhone's device name

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

For xamarin user, use this

UIKit.UIDevice.CurrentDevice.Name

For Swift 4+ versions, please use the below code:

UIDevice.current.name

For swift4.0 and above used below code:

    let udid = UIDevice.current.identifierForVendor?.uuidString
    let name = UIDevice.current.name
    let version = UIDevice.current.systemVersion
    let modelName = UIDevice.current.model
    let osName = UIDevice.current.systemName
    let localized = UIDevice.current.localizedModel
    
    print(udid ?? "") // ABCDEF01-0123-ABCD-0123-ABCDEF012345
    print(name)       // Name's iPhone
    print(version)    // 14.5
    print(modelName)  // iPhone
    print(osName)     // iOS
    print(localized)  // iPhone

Device Name would not work out of Box now, Need to have a special entitlement.

Entitlement : com.apple.developer.device-information.user-assigned-device-name

Doc : https://developer.apple.com/forums/thread/708275

Official : https://developer.apple.com/documentation/uikit/uidevice/1620015-name

In Unity, using C#:

SystemInfo.deviceName;