Why can't I send or receive pics on my iPhone?

It won't let me send them. Or receive them. It only shows a red exclamation sign next to it. Can anyone help me?

Iphone can only share files to another iphone… It can't share or receive files from other phones

You may have cancelled your data plan or something is wrong with it. You need a data plan to send pictures over MMS. Even if you are connected to Wi-Fi, you can't send pictures without data.
And the age of the iPhone doesn't matter. All iPhones ever made can support MMS.
And of course the iPhone can send files to any phone, not just the iPhone. Those are just fabricated misunderstandings.

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