I have seen several posts on this but nothing that ever provides a solution. My ringing time before going through to voicemail is about 17 seconds and I want to increase this.
I have tried the code to try and increase the time as I have the newer SIM, **61*+447458333222*11*30# but I get an error message as other users appear to have done. It states:
Call forwarding
When no reply for All Speech Services
Connection problem or invalid MMI code
When I try *#61# to see what it is set to but it states 'not forwarded' to all items listed.
Voicemail is working fine, and the calls do go through to voicemail after the 17 seconds. Please can anyone advise how I can increase the time as it is very frustrating?