Why can't I send pics or videos to non iphone users?

I have a IPhone 5s and I can't send pictures to anyone that doesn't use imessage, why is this and is there anyway to set my phone to send pics to all phones and not just imessage users?

There's an option in your Settings that allows you to set it send messages by SMS text if it can't send them by iMessage.

? I get images from friends all the time. I'm on LG, they're on iPhone. Just send the images by SMS.

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