Hoping I can get some help here. I have an unlocked Nokia Lumia 920 and a topped-up prepaid account. The phone can receive calls and texts but the internet doesn't work (albeit wifi works perfectly). I also have an HTC Windows Phone 8x and it doesn't work with Koodo prepaid either. On the other hand, my Blackberry Z30 works perfectly with data, calls, texts etc. My question is: what could be wrong with the Windows Phones? Settings? Card? Any ideas?