Extending ring time Oppo A5

[Booler]

My wife has an Oppo A5 which only rings for a short time before ringing off. Also, the ring time does not appear to be consistent. Sometimes it's longer than others.

I have tried dialling the codes to change the ring time but the phone is not accepting them. When I try to do this I get an error message ...

Call forwarding
connection problem or

invalid MMI code.(0)

Any Ideas?  

[MI5]

@Booler 

App and web guide here https://community.o2.co.uk/t5/How-to-Guides/How-to-Lengthen-Ringtime-on-any-O2-Mobile/ba-p/1175217

You can do it in your MyO2

Under the MyO2 drop down

• Under the Your Sim heading select Bar and divert
• Under the heading Manage your devices and services select Divert calls
• Scroll down and you have a comprehensive Call Diverts menu to Edit (bottom left)

[Booler]

Thank you , but I tried the above on my wife's phone. It had no effect. I also did it on my own phone and it has actually decreased the ring time to abolut 12 seconds. ☹️

[MI5]

Can't fix O2's deficiencies. Only advise on the process, sorry.

[Enlli]

OK, this works on Samsung phones using MMI codes.

Turn off WiFi

Turn off mobile data

Set network type to 2G only or 2G/3G

Execute the MMI codes.

You are basically turning your phone back to an old 2G phone of the type available when these codes were introduced.