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Caller ID is spoofing Comcast.  Usually they hang up immediately if you answer, but this time someone was on the line, saying he was "Mike", a Comcast technician. (Background noise was that of a very large calling center.) .  He stated that they had had a major problem with their central servers and that they needed to check some of the services.  I laughed and told him I knew he was a scammer and simply hung up.  I do not have Comcast service.

Called my mobile.

Wanted to know how I liked my comcast service don’t have them ask me who I had told him none of his damn business

Another one of periodic spoofed/scam calls from this number, didn't answer, not inclined to call back.

Same type of spoofed call with the Comcast customer service number but the name in the CID is Clear Link Systems, a call center/telemarketer in OK.  Bizarre!  Did not answer and they left no message!

Someone with a Southeast Asian accent who identified himself as John Brown called. Caller ID said Comcast. He told me that my modem is no longer protected by the firewall and that unauthorized people recently connected to it to do potentially illegal things. He said my firewall protection was on low. Did I change it? If not, he was happy to report he blocked the bad users and has a solution so that it doesn't happen again. He gave me his "info" including a non toll free number.

Supposedly he pinged my modem. When nothing happened he said it's because my firewall is off. He needs me to go to a computer to find my Xfinity account number and then download an app to show me who has been logging into my modem.

I explained I have the Xfinity app on my phone. I checked and it shows me who logged in the past year. Nothing seems off. "John" said his app shows more info and will verify his contact info. I said I would just call customer service later. He said if I call it will only link me to a local office who won't have access to our conversation. After refusing again, he said if something bad happened it's on me and not them, that this is a recorded line. I said okay and hung up.