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)
A video you can refer to:
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