Scam call

Caller: I don't know

Called by this number picked them up and straight to the hold music tune.

hung up on answering

Missed call from this number. Tried to return call to get "The number you have called is not in service please check your number and try again"

Clearly either a scam or telemarketing

These are obviously Robo calls. I have all calls not in my phonebook on silent so I never hear them. Then each evening I add them to the blocked list. Only calls in my contacts list will ring. They are annoying but I don't lose any sleep over these robo -_harrassment calls Just block and delete and LOL