Xfinity has a forced obselescence policy. If you have a phone on their network but switch to a different phone, they "remove it from your account". Then when you try to bring that phone back for another line, they say it can't be added to the system because it is too old. Even though the phone was ON THE SYSTEM. This has happened to me with both an iPhone and a Motorola phone. Their system is criminally wasteful.
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