HTC Magic :: Phone / Connection Acting Very Weird

So, I'm an HTC Magic user, I bought my phone unlocked from Greece and use it in the UK on Orange pay as you go. Following an sms w/ an attachment I received, the phone has been acting very strange and I need your help.Ok, I'll try to make this as clear as possible. So, because I'm on pay as you go, I have two apn options, one of which is fake, so that i can change from/to the proper apn settings whenever I want and the phone doesn't automatically connect for any reason if I don't want it to (so as to avoid paying). I was on wi-fi most of the time anyway. This was working perfectly for me, until.About 3 weeks ago, I received a txt message from 1550 (which, I think is orange's spambot) with the word "RockCorps" and an attachment. I accidentally clicked "download" and then clicked cancel as soon as I realised. I'm not sure if anything downloaded at all, nothing I noticed.HOWEVER, following that exact message, suddenly, although I was on the "null", fake apn, my phone went on gprs. I could see the icon and the NetSentry app recorded activity as well. I have NO clue what it was trying to download or upload at all.

I went into the apn switching screen to make sure I wasn't still on proper GPRS from the last time, but the selected option was the fake apn, which, up to then, gave me no data. No settings had changed on the fake apn, but it seems that even without selecting it, the fact that I had the proper apn listed enabled mobile data.