Why won't my iPhone 4 send pictures?

I've had my iPhone for a little over a year. It would rarely send pictures. I updated it to the iOS5 recently. People are saying that's why they wot send but even before that it was rare for my pictures to send. I can send pictures to people with iPhone 4s' but not other phones. I kinda think that it might be because it's unlocked and it's tmobile. My family was saying maybe tmobile isn't updated for iPhones yet. I don't know, please help!

Cool story tell it again

I would suggest setting up Email on your phone and sending pictures that way.

Yeah i believe its because of the phone being unlocked. When you send images to other iPhone users it is sent through the process of " iMessage " not T - mobile.

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