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John, Engineer and electronic enthusiast for more than 12 years.
Category: Consumer Electronics
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My cell phone Home-9B21 and xfinitywifi both say

Customer Question

My cell phone Home-9B21 and xfinitywifi both say authentication error occurred. The little circle next to ON just keeps going round and round? Now it shows Home-COD3-2.4, then incorrect password?
JA: How old is the phone?
Customer: May 2017
JA: How long has this been going on? What troubleshooting have you tried?
Customer: Inserting password. it has been happening for about a week. Someone who said they were from Comcast Infinity called about a week or 2 ago, asked me questions re internet, nothing personal, said he checked it and all is fine? No, didn't understand his name.
JA: Anything else you want the Electronics Expert to know before I connect you?
Customer: no
Submitted: 1 month ago.
Category: Consumer Electronics
Expert:  Kris R replied 1 month ago.

Sorry for the delay, we are busy and I've just got to your question.
How long has this been happening?