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Is there a Diagnostic menu in Settings somewhere? near the Bottom of all the other Menu options?
You can try there, and test the speaker. or
Try going in to the service menu - if the M4's are like the Z5, then dial this in the phone dialer:
*#*#7378423#*#*
Then go to tests, and test speaker...
edit: and by speaker, i meant "earphone"
Hi,
It did not fixed.
I had to submit my phone to service center.
yet to get update from them.
Regards,
Sumanta