Can I use Hullomail for voicemail on Plusnet? If so, how do I set it up?

[#1]

Hi all
I moved over from Vodafone to Plusnet back in December. I had been using Hullomail for my voicemails but when I switched over to Plusnet they stopped working. I'd forgotten about it as I don't get that many calls at the moment, but I had a few missed calls last week and thought I should try to set Hullomail up properly, but I can't get it to work. I've deactivated and reactivated voicemail in the Hullomail mobile app but that's not resolved it. 
Can you not use Hullomail type services on Plusnet? If so, how do I set it up?
Thanks

[#2]

Unfortunately, Hullomail will not work on Plusnet. This is due to call forwarding only working for Plusnet voicemail. If you change the forwarding number to anything else it will not work. I have the same issue. It is such a shame as they have recently made enhancements to the Hullomail app.

[#3]

Ah, ok, Thanks Colin. That's very frustrating. At least I'm only with Plusnet temporarily until I decide on a new phone. Good to know though, I really like Hullomail and it'd be black mark against going with Plusnet mobile again. 
Thanks again