Suggestion:
No, not for a Modem.
You'd need one if you want a wireless router (just the 1st time, to set-up your password (WEP key) in, so neighbor don't steal your network).
If you want it wireless, just get a friend to come with a laptop and a small Ethernet cable once to set it up.
Hope this helps a bit

{ 1 comment… read it below or add one }
ya definitely you need a computer to program your modem
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