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    Before anything else, have you checked whether the modem has a public IP address at all? Its status page has a "WAN IP Address" under "Device Information". Does it show a public address or a private one? Does the address shown in the status page match the address shown by Google?
    – grawity_u1686
    Commented Dec 27, 2022 at 20:45
  • Did you add an allow firewall rule for your port forward?
    – Dr_Xunil
    Commented Dec 27, 2022 at 20:48
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    Be aware that most cellular services either use Enterprise grade NAT or block all incoming connections (regardless of what port it is on)... This is often not a usable scenario you are trying to do.
    – acejavelin
    Commented Dec 27, 2022 at 20:50
  • @acejavelin wow! I didn't know that... You mean that anyone using SIM internet, that wants to do home networking and setup public servers at home have no possibility of doing so?
    – Cristian
    Commented Dec 27, 2022 at 20:56
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    Do you have internet in your network with this setup? Have you contacted your ISP Support and asked if you need a static IP for incoming connections? (Note that a static IP may require additional payment.)
    – harrymc
    Commented Dec 27, 2022 at 21:22