Why can't i send pictures on my iphone 4?

I have an unlocked iphone 4 with tmobile.every time i try to send pictures it says not delivered with an exclamation mark next to it. I can't receive pictures either
what do i do?

Added (1). No it's on

Is your data turned off?

Make Sure a Data is on and YOUR Wi-Fi is Off i can't stress that enough i had this same issue when i first got mine i'm sure once you turn Wi-Fi off it will work correctly! Cause when your Wi-fi is on it over powers the data and takes over. And pics will not come through Wi-Fi… Make sure you turn your Wi-Fi back on once your done to avoid going over your data!

Hope this helps!

Once you turn Wi-Fi off you should start getting all the pics instantly!

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