For iOS, it does not allow the App to use the location service by "Always", but the Auto Unlock function requires the location service by "Always". Please follow the steps below to set up.
Step 1. Open the U home App, go to Lock's Settings page >> Auto Unlock, and begin to set up Auto Unlock. Please tap ”Open Settings".
Step 2. When the iPhone settings screen pops up, please tap "Location">>select "Always". Also, please enable the "Precise Location" option.
Related article: How to Set Up Auto Unlock for Ultraloq U-Bolt Series?
Related FAQs: Troubleshooting for Auto-Unlock feature