How to change voicemail number
I am on GiffGaff which is a virtual network of O2 in the U.K. As a result the dialer thinks my voicemail is 901 rather than 443. I wouldnt normally care but i have a persistant notification to check my voicemail. I am unable to change the voicemail number in the dialer for some reason as the setting is greyed out. Instead i found a voicemailconf.xml file under /system/etc, and there also one in /etc.
This is a lookup dictionary for all the networks and their voicemail numbers, ive tried editiing the O2 one to 443 in both files but after restarting it goes back to 443. Really annoying what am i doing wrong, now do i make this permantent?