Audio quality during phone calls on Xperia 10 II

REPRODUCIBILITY (% or how often): 100%
BUILD ID = OS VERSION (Settings > About product): 4.2.0.21
HARDWARE (XA2, X10, X10 II, …): X10 II
UI LANGUAGE: German
REGRESSION: (compared to previous public release: Yes, No, ?): ?

DESCRIPTION:

During phone calls the phone ear speaker produces the hum/buzz sound (known from a cellphone being placed next to an external speaker) for the complete time of the phone call. This sound is also heard by the receiver of the call on his telephone. Changing the sim card to another provider did not solve this problem. Also setting the network from 4G to 2G did not solve the problem. Signal strength is above 50% or much higher. This sound is not heard when making a phone call e.g. via Whatsapp.

PRECONDITIONS:

None

STEPS TO REPRODUCE:

  1. Make a phone call

EXPECTED RESULT:

Clear audio, similar to previous phones (e.g. Xperia X with Sailfish OS)

ACTUAL RESULT:

hum/buzz sound during phone calls

ADDITIONAL INFORMATION:

Maybe similar to Terrible sound quality during voice call when roaming - tested on multiple phones but not related to roaming.

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