The first and simplest way:
You may try to turn off your phone's mobile data or turn on the airplane mode.
The second way (while keeping the mobile data with WIFI on)
1. Download the VLC video player from the Apple store.
2. Please connect the dashcam's Wi-Fi to your iPhone.
3. Open the VLC app, choose Network on the bottom and insert rtsp://192.168.1.254, click open the network stream as shown in the picture.
Note: for A129 PRO, the link should be http://192.168.1.254:8192
4. Click the network address, you may see the live view as below