I highly doubt that its because you are too far away from a tower to make a call. I have two phone lines with xfinity and I can be standing side by side with the phones and 1 will requre re entering the phone number and the other will not. Also the one that now has this problem dialed out normaly in all areas for the first 6 months of ownership.
This problem is horrible and it seems the only way to fix it is to leave xfinity.
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