1. The user may have opened voiceover by mistake, please close it. Just turn on your Apple phone, click "Settings", find and click "General Options" in the settings interface, then select "Accessibility" and turn on voiceover.
2. The screen of Apple's mobile phone is shaking, or it may be because the phone is dropped, resulting in the screen line being loose. In this case, it is recommended to take the mobile phone to the after-sales service shop and ask professionals to check and repair it.
3. It may also be the reason for the mobile phone membrane. The mobile phone membrane generates static electricity on the mobile phone, which interferes with the induction of the capacitive screen. You can try to use an antistatic film instead.
4. If the user is charging, the screen of the mobile phone will shake, indicating that the charging current is unstable or the charger is the reason. If this is the case, it is suggested to replace the stable voltage or replace the original charger and original data cable that are normal and intact to charge, which can solve the problem of mobile phone screen jitter.
This answer applies to most of Apple's mobile phone models.