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I see a house, why not use the Pi's Wifi instead of a modem?

Says it’s their countryside house, so may not have wifi at home.

User is somewhere in EU, and data plans can be cheaper than fixed-line connections if you use under 100gb/month.

Sometimes faster too.

It does use the built-in WiFi to connect to a WiFi network created by the mobile modem I placed at the neighbours house which has a permanent power supply.

I considered using a mobile USB modem attached directly to the Pi but that requires extra effort keeping it connected with something like a cron task that pings 8.8.8.8 and restarts the connection if there is no response.

ok, that makes sense. I thought it connects to a 3G/LTE network for internet connection. There are a few Raspberry HAT that offers this -- although that would be extremely costly for a live video feed

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