My iPhone 4 receives and sends text messages but can't send or receive photos?

Barely bought a new iPhone 4, put my sim card into it and the iphone won't let me receive or send picture texts. I can send message texts and receive them, but not picture ones. It keeps giving me an error (red exclamation point) on by my picture.

Added (1). Tried all your suggestions. Still doesn't work and yes I can attach to emails and stuff but just can't text photos.

Just double tap home hold on Message push the minus bar, then reopen and try again. If that doesn't work restart your iPhone. Finally, if all else fails try to turn off and then on your network.

Are you able to attach tem to an email?

Go to your settings and to messages and check that your mms is on first. You can call your carrier and they can do some checking. When I got my iPhone 5 I had that issue and Verizon had to fix a setting on their end.

There's no on/off for messages on my iPhone 4. No minus bar. No home hold.

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