Your UDID is a unique identifier that Apple uses to associate a device to an iOS developer account so that developers can install and test their apps before releasing them.Įvery iPhone, iPad and iPod Touch has a Unique Device Identifier (UDID), which is either a 40-character alphanumeric string (on iPhone X models and prior.) Or a 24 character identifier with a dash after the 8th digit, on iPhone XS and subsequent models) that is unique to each device.
