My IPhone 5 won't send pictures to other phones, but it will receive them?

If it is sending to another iphone it will send, but not to a non iphone

Try restoring your iphone by pluging it into itunes

The same problem happened to me I made sure my Internet data/cellular was on and I had Wi-Fi
If it doesn't work go to your phone company or the apple store

First check whether MMS messaging is on and put it on if it is off. If it does not send the pictures still, contact your carrier since it could be possible that you are not signed up for the picture messaging in MMS. If this is the case, they will send the provisional settings to you via your iPhone, after which you will be in position to send pictures.