IPhone 4 won't let me send pics to other phones?

My iPhone does not let me send pics to other phones trough messaging. Is it because it is not compatible (galaxy s3 ) or what? My phone is unlocked for t mobile with the r sim and I don't have an Internet plan. Is it because of this?

Turn cellular data on in settings

You need to have a plan. And that means your cellular data and 3G should be on

I've had problems with picture messaging on my iPhone 3GS. I called customer support and they told me I have to turn on my 3G in order to send and receive pictures.

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