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swaping cable modems how does it work?


swaping cable modems how does it work?

I have a netgear cm1100 it says it xfinity ready 3.1 modem  for full one gig plans?


I have it on now but i cant get full speed most i can is get 500 or less and before i had 960.


The other problem also when i turn on modem i activate by website and it work it was showing on website for devices but now it not showing my devices on my account as i did not call comcast is there problem on my modem will i still get my full gig plan?