I have changed the SIM card in my phone, as instructed but now I cannot get internet on my phone. Phone and text are fine. I have tried the sim in another phone and have the same issue. There was a load of questions about profiles and automatically receiving something [ who knows what? its just a load of acronyms and gibberish ] Then I kept getting texts from virgin. I managed to stop the texts by uninstalling whatever it was. My guess is I uninstalled something that to do with internet. There was nothing wrong with my old sim so why send me a new one?
I have not tried rebooting the phone, unless that means switching it on and off again as I do not wish to make things worse. I can at least use the phone for calls and text as it is now. I looked at the page in the link you gave but that is just a long list of acronyms and gobbledy **bleep** and means nothing to me. Fortunately I rarely use the internet on my phone and my 250 mb of monthly data is often untouched at the end of the month.