Here is my phones id by XS++:
And secondly, thanks for advising acoustic changes but i heard that firmware version also have effect on phone's sound.22:05:40| Baseband ID: 9900
22:05:40| Protocol Version: 3.1
22:05:41| Phone name detected!
22:05:41|
22:05:41| Profiling SEMC phone...
22:05:41| Platform: DB2020
22:05:41| OTP CID: 49
22:05:41| EROM CID: 49
22:05:41| EROM Color: Red
22:05:41| IMEI: 35240101xxxxxx
22:05:41| Phone ID: W850
22:05:41| Region: EUROPE_2
22:05:41| CDA: CDA102677/76 R2A
22:05:41| Firmware Version: R1ED001
22:05:41| EROM: R3A016
22:05:41| Ready for operation!
22:05:44| User chose NOT to update EROM CID!