IPhone 4 won't let be send pictures?

I have Wi-Fi on an my imessage is on, an so is the MMS is on aswell,
But before like a week ago I didn't have a problem with it but now it just says tap to download an it won't download the picture if I tap it. What do I do?

Restart your phone or save all your stuff and go to settings, and the go to reset and then reset all settings.

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