How do I find my IDFA (Identifier for Advertising)? (iOS devices only)

Unfortunately iOS does not currently provide a way for you to see your device's IDFA (Identifier for Advertising). There are some free apps on the App Store that will display your IDFA. Here are a few we've used that appeared to give the right information at the time we tried them (note that we don't have a relationship with these companies and thus can't vouch that these apps aren't malicious, or that they will give the right information in the future):

• IDFAVerify
  • Note: As of 2022-07-11 I'm not sure this is still doing what it used to do. I would recommend using a different method.
• My Device ID by AppsFlyer - Whitelist Test Device
  • Note: This app will show only zeroes unless you give it the appropriate permission. To do so,
    1. Launch your Settings app.
    2. Go to Privacy >> Tracking
    3. There should be a switch for "Allow Apps to Request to Track". Turn it on if it's not already on.
    4. There should be a list below of some installed apps. Find "DeviceId" (the name of this app), and turn that switch on if it's not already on.

Note: If you are interested in your IDFA because you want to request that a company look up and/or delete your personal data, do not use the "Reset Advertising Identifier" button in your Settings app until you've written down, taken a screenshot of, or otherwise remembered your current IDFA. The "Reset Advertising Identifier" button gives you a brand new IDFA, but companies will have your personal data recorded under your old IDFA and won't be able to find your data if you don't know what your old IDFA was!