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  • Sometimes the driving side has pull-ups / pull-downs... and sometimes the driven side - on a data, clock or chip select/enable line. At least the manufacturer accommodated with pads for one to put on... (I assume it was one that kind of thing with the resistor...).

  • Pull up/down it was not. Zero ohm resistors, AKA jumpers are connecting the pins of the SIM card connector to the module. One was missing. Forgotten or not properly soldered and lost.

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