Custom board using an nRf9160 with Simcard issues

We are using a custom board with an nRf9160, and have tested it with several sim cards.
The board has been tested with a spectrum analyzer and it is able to transmit RF, however, we are not able to receive anything back. The sim cards which have been tested are Hologram, iBasis, and T-Mobile. All cards work on the nRf9160-DK board, but not on the custom board.

The correctly functioning nRf9160-DK board with the iBasis card gives the following results:
%CESQ: 32,1,18,2
+CEREG: 2
+CEREG: 5

The custom board with the iBasis card returns:
+CEREG: 2
%CESQ: 255,0

The custom board with the Hologram sim card returns:
+CEREG: 90
+CEREG: 90

the custom board with the T-Mobile card returns:
+CEREG: 2
%CESQ: 255,0
+CEREG: 4
%CESQ: 255,0

Thanks

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