Just had my Alcatel IDOL 4S phone serviced at the Microsoft Store. After having a problem hearing with the headphones, I rebooted the phone but then ran into a problem with not hearing callers unless the headphones were used, or unless the phone was connected via Bluetooth...
I was told there is a known bug with this phone where the telecoil option is turned on and prevents callers from being heard.
He just went to Settings - Ease of access - More options, and turned Telecoil OFF.
Also posted answer here:
Why is it that my phone has no sounds?
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