Guys,

I've just switched to 3 from T-Mobile.

I've been using Hullomail for a while now and had my voicemail button, in the phone app set to call the HulloMail number.

I know I'll probably never need to call it but I do occasionally catch the VM button when making calls and it's one of those things that nags me, knowing that I've failed to change it.

Previously I'd dialed *5005*86*VMnumber# which worked a treat.
I've tried that this time to no avail, it is still set to the default 3 VM number.

I've tried several different combinations that are suggested in different placed and nothing has successfully applied.

Have 3 somehow blocked the changing of the number or has anyone else managed to change it?

It took me some time to set it with T-Mobile come to think of it, I don't remember what I did in the end though.
Already tried resetting network settings.