My service is from T-Mobile and I just unlocked an AT&T Nokia Lumia 900. My phone plan with T-Mobile includes unlimited texting but no data. I was able to send and receive picture messages on my old T-Mobile phone but after switching to the Nokia Lumia 900 I can't seem to do either. I've been reading up on some other posts and it seems that data and picture messaging go hand in hand but I've never had that issue with my old T-Mobile phone. Can someone shed some light and possibly provide some alternatives?