No we can't!
I'm not being obstructive; it's simply that your voicemail isn't stored on your phone. It's stored on the servers of Vodafone, O2, Orange or whoever else it is that provides your mobile phone service. So we need to know which network you're on, in order top give you the relevant information (which will apply to all users on that network, irrespective of which phone they've got).
Chris



