How it works?
UDIDiPhone.com uses Apple Mobile Device Management (MDM) to fetch and display your device info. Profile that you install can query the device information of your iPhone or iPad to your device browser. This profile is temprorary and won't expose any information. Once the data is sent to browser profile will be removed from your device. We do not store your information.
Goto iOS Device Settings General Profiles to check if any profile is installed. If there is no such section then there is no profile installed on your device.
An Apple Mobile Device Management (MDM) can query devices for a variety of information, including hardware information, such as serial number, device UDID, or Wi-Fi MAC address; as well as software information, such as the iOS version.