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Do any ROMs, stock or otherwise, support HSP or HFP? Here is the usage case;
Phone > Z Ultra GPe w/ no SIM > Audio
(Z Ultra acts as BT Speakerphone)
This is technically possible as I've done it with a Nexus 7 and a ROM that supported HSP/HFP.
(posted this in the wrong section, should be in Q&A. Sorry, have not had my coffee today)