SMS* or cron job to open a connection from R Pi to Cloudflare or a website to wake the 5G connection. Then your connection to R Pi server might work.
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And there others that say it work.
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Maybe something in the home is using the internet when they need to connect.
Certainly it can work, but inherently unreliably if it's a mobile/cell connection.
[* I used an old Nokia and serial port adaptor to control PC with SMS. Only "allow listed" numbers and the first word of the message would be the command. Nothing able to be deleted or changed. A reply SMS was a stock level. Data was charged per second in those days and many phones had no email anyway. SMS on a PC is still handy if you have password.
Nowadays with widespread spoofing I'd have a password too. Also there are now cheap Mobile/cell modules for Pi GPIO port. You do need an account and SIM. The modules are a fraction of the USB/WiFi access cell/mobile hotspots and unlike them give Pi access to send and receive SMS, make or answer voice calls etc.]