Sorry to bump up this old thread, but since it's amongst the top google results for 'Vectone APN' I thought I'd share what I have found through their customer service...
The APN is literally just the word internet, no username and password required.
You must also ensure data roaming is enabled on your handset for Vectone internet to work.
If you've been brought here via Google, why not check out giffgaff's pricing rather than Vectone because you may find it to be cheaper.
