Can't send pictures from my iPhone 4S to a Samsung galaxy s3

My friend Just got the Samsung galaxy S3 and I'm not able to send pictures to them it says I'm sending it to the wrong carrier on their phone but on my iPhone it says message sent successfully. I can't figure out what's wrong.

Any help or advice would be great.

I think it's your friend's problem.
When she got messaging from her phone carrier, maybe she didn't get picture messaging nor video messaging.

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