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OK I figured out some issues.
I used the AT command manual for this SARA-R5 modem.
I tried the first general commands (which manufacturer, which model, which version, which IMEI…).
Then I tried AT+CCID which is to check the SIM card identification number. This returned ERROR. It didn’t specify which error, so after a while, I looked at the modem and inserted the simcard the other way. Same error. I restarted the pi and now it worked passed this error! (see screenshot).