Unable to read and write on SIMCom Module

I am working on Simcom module (sim7600e). I was unable read and write into the this module.

I got the following reply when I try to read.

toradex_apalis6q:/ # cat /dev/ttyUSB3 &
[1] 1079
/system/bin/sh: cat: /dev/ttyUSB3: Try again

I fix this problem

This the sim network problem and this one solved when sim got network

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