Problem with iPhone 15, no network outside the house?

Since I installed my new 5G SIM card on my iPhone 15 a few weeks ago, I can no longer receive any network as soon as I leave my Wi-Fi range, neither LTE nor G5 as originally described. I asked the customer service, and they told me I should switch the phone to G2 or G4. Can someone explain the steps? The service isn't responding, and Google doesn't seem to have any idea how to do this. So, my question is, is there a user here who knows the problem and has solved it? Thanks in advance, and have a nice Friday.

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HeinzHubert
2 months ago

Settings, mobile, data option, language & data = LTE

5G is not available anywhere.

Curasanus
2 months ago

Wipe from the top right to the bottom: then the top left of the send mast symbol must light green. After that go to settings, and call mobile data.