I can't send pictures on my iPhone 4?

Okay, so I switched to a different Apple ID, and now I can't send pictures! I'd like to know why this is happening, and how I can fix it. My cellular data is on, my MMS is on. And I can't switch back to the old account, because then I'll receive messages that my sister sends from her iPod. Please help!

Added (1). My internet works fine, and I can receive pictures too.

I'm not sure but you might not be connected to wi-fi. Mabye your intrenet isn't working.

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