Welcome to LQ!! repo gave you the first suggestion..... change you thread title to something more descriptive.
Quote:
but the command doesn't work in Red hat
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What command doesn't work? What is the make and model of the modem?
In either Ubuntu or Fedora, run something like dmesg or lshw and look for your device and see what driver it is using. You may have to install that driver in RHEL.