Welcome to Vodafone Community
hs.vodafone.ie is for mobile broadband
live.vodafone.com is for using bill pay or pay as you go mobile services and tethering on these services.
Use the wrong one for the wrong service and you'll either be charged or it wont work. Data services do seem to be affected by an outage at present though.
So, just to be clear: the "normal" internet allowance can be used both on the phone and for tethering, whereas the mobile broadband can only be used on the phone (without extra charge, that is). Is that correct?