I have not done phones, but the others many times.
As long as the pin is set for digital SERIN/OUT/2 will work on any pin that is an I/O, You can have as many pins as you want taking turns doing serial.
You can mix and match SERIN, SERIN2, and HSERIN.
If you are slick, you can HSERIN on the hardware and SEROUT on another.
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