If you have no APNs in your list then attempt to download the settings via the phone.
on the miro do this, settings > Xperia > Internet settings, accept its going to do stuff on the internet.
When the operator list appears, select O2 pay & Go or nearest equivalently named.
The phone will do it thing and then fail to connect.
After that then follow the instructions as above but DO NOT change the name, keep that the same. It worked for me.