My iphone 4 won't let me text photos?

It always says that it doesn't deliver. When I try again it fails. Why does this happen?

Need memory card

I'm not sure but maybe check on apples support page

This is not an iphone but a service provider problem. Photo's are sent as MMS not SMS text. It seems your provider supports this as it is sending, but your recipient doesn't have MMS (Media Messaging Service) available so they can't receive your photos. OR they don't have it active.

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