Increase handset volume?

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Is it possible to increase the handset volume not just temporally?

I´m driving a truck and it is really difficult for me to understand the person i´m talking with, volume is already set to max.

I figured out that it is possible to increase the volume in ( *#197328640# ) service mode - audio - handset - volume numbers 1 to 4 i set to 100.

Thats working good for me until i reboot, than the settings are reset to default. I already searched for a config file without success.

Maybe someone has more luck?

I cant see the volume setting in the service mode.
Non rooted jf3

Need a program

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We will need a program which starts with boot and changes the settings to max everytime it is started. Some experts can help us.

Originally Posted by rkadve

We will need a program which starts with boot and changes the settings to max everytime it is started. Some experts can help us.

Yes, i hope. I still believe there is somewhere a config file already.

just have a question @Bajo76 - how did u enter the value i cant see any keyboard or numpad or volume rocker does not increase the value to 100. Please lemme know.

Originally Posted by shawn_pro

just have a question @Bajo76 - how did u enter the value i cant see any keyboard or numpad or volume rocker does not increase the value to 100. Please lemme know.

Left settings button, select Key Input. then enter value

Thanks @JaGuR. :)