We had some time to play around with Face ID on the iPhone X and during that time we found out that it does not always work as it should. Face ID, however, will almost always scan your face on the first try if you've used some or all of those tips that also apply to the iPhone X S X S Max, and X R .
Tip 1: Keep Display Clean
The new TrueDepth camera system is in the black notch on the top of the screen, so keep this area clean of debris and dirt. Of course, if something prevents the TrueDepth camera system from doing its job, face recognition will not work (or not at all).
Tip 2: Disabling Attention Detection
"Requiring attention to the face identifier "is a specific iPhone X, X S X S Max and X R Setting that prevents face recognition from unlocking your iPhone until you see it directly. The setting needs your whole face – including eyes – to unlock your device. It will not work so well if you wear sunglasses.
While the face ID is relatively constant, this setting can occasionally cause some grief, at least under certain conditions, as in the above-mentioned sunglasses example. If you disable it, your iPhone can be unlocked even if you are not viewing it directly, reducing the risk of failure.
Disable it in the "Face ID & Password" settings.
Warning: Know that someone without this attention-grabbing feature could unlock your iPhone by pointing it at your face while you're not looking (or even when you're sleeping).
The Face ID works best if you just need to focus on your face. The TrueDepth camera system sends 30,000 infrared rays of light to your face to identify you before you unlock your iPhone. This works well in places where there is a greater contrast between your face and your surroundings, such as: B. inside or even in the dark. If your face can be the center of attention, you will have the greatest success.
Where you may be in trouble, is outside in bright sunlight or in buildings with certain lighting conditions where the camera will have difficulty distinguishing the surrounding objects or lighting. When it's sunny outside, make sure the bright sun is not directly behind you.
Tip 4: Keep an Optimal Distance
If you have problems unlocking your iPhone X, X S  X S Max, or X R with your face, try to correct the distance. Apple claims that the optimal distance for working with the Face ID is 25-50 inches or 10-20 inches. You may need to change the way you hold your phone, but the compromise is worth it.
Tip # 5: Be Still
Face ID's 30,000 infrared beams work best when they hit a stationary device target. When you're on the move, it becomes harder for the system to detect your face, and it can take several attempts to unlock your iPhone X. For best results, do not move – but you do not have to wait long because the Face ID feels so fast or even faster than the Touch ID.
If Face Detection fails, do not reposition your face to try again. Instead enter your access code to unlock your iPhone. Your iPhone will then save the failed face attempt in your profile, provided you have exceeded a specific face recognition threshold. If you do it right, you should find over time that the face ID is less and less failing.
Sunglasses and face IDs may not be the best pair. Some sunglasses seem to work well with Face ID . However, if you have a particularly dark pair, you could prevent these IR rays from "seeing" your eyes, resulting in a lockout.  Remember to push your sunglasses up for a second while unlocking your iPhone – you can be cool right after that. Or, go back to Tip 2 above and uncheck "Require attention for face ID" and see if that helps you with your favorite sunglasses.
Tip # 8: Register a Second Face
In iOS 12, you can add another face scan to your iPhone's biometric database. You can scan another person's face if you're sharing the iPhone, but you probably do not want to scan your face again unless Face ID has difficulty confirming your face. For example, when you wake up, at night in bed, or when wearing your favorite hat or sunglasses.
Registration of a second face is easy; Just tap on "Set up alternative presentation" under appearances . For more information, see our complete guide.
Tip 9: Know the rules
Feel that you have more Passcodes than successful Face ID scans? It could have different reasons. The Face ID automatically turns off when you press a special key combination (intentionally or accidentally), after rebooting, and more. Here are all instances directly from Apple's website:
- The device was just turned on or restarted.
- The device has not been unlocked for more than 48 hours.
- The access code has not been used to unlock the device in the last six and a half days and Face ID has not unlocked the device in the last 4 hours.
- The device has received a Remote Lock command.
- After five unsuccessful attempts to customize a face.
- After initiating the power-off / emergency SOS by pressing and holding both the volume and side buttons for 2 seconds
- When the device battery is below 10%
Tip 10: Reset Face ID
If none of these tips helped you use Face ID more efficiently, it may be due to a poor scan the first time you register your face , In this case, you should try to register your face again. So, go to "Face ID & Passcode" in your app settings, enter your passcode and then tap "Reset Face ID". From there, just go through through the normal steps to reestablish the face ID.
Have you seen any good face? ID tips in your news feeds? Let us know in the comments below!