What is a UDID? Can I test a game on other iOS devices after I added only 1 device?

Question

I am creating Apple Developer Account and they asked me to provide a UDID I have 1 iOS device. If I give them my ID and after it I change my iPhone what should I do next?

Can i test app on the next device?

Answer 1

Unique Device Identifier - The series of numbers and letters used by Apple and developers to uniquely identify your iPhone, iPod touch, and iPad.

You are allowed to register up to 100 iOS devices for testing and Ad Hoc distribution per membership year. Although you may remove a device from your account, it will continue to count against your 100 device limit.

At the start of your new membership year, Team Agents or Admins can sign in to the iOS Provisioning Portal to remove listed devices and restore the available device count to 100 devices. Be sure to remove all devices you no longer use for development prior to adding any new devices.

You can add a new device in the Devices section in the Developer Portal. If you add a UDID of your current iPhone and then get a new one, you will have to add the UDID of the new iPhone as well. Basically, you can only test on the devices which you added to the portal.

Source: iOS Developer Program

Answer 2

You can test on up to 100 devices, you add those devices at your developer portal at https://developer.apple.com/

Click member center, login, and select Certificates, Identifiers & Profiles.

UDID is there to make sure that you can only install/give your app to limited number of devices outside of AppStore.

This site explains nicely how to find your UDID: http://whatsmyudid.com/