The issue may happen in some iPhones.
Please try to disable the VIOFO APP from accessing cellular data in the setup as the pic below.
There are more TIPS related to WIFI and APP for your reference.
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The issue may happen in some iPhones.
Please try to disable the VIOFO APP from accessing cellular data in the setup as the pic below.
There are more TIPS related to WIFI and APP for your reference.