Iphone won't receive MMS from other phones?

I have an iPhone SE, and when ever people send me pictures or MMS messages, they don't come through. I also can't sen them, even to apple users.

Doesn't anyone know how to fix this?

You should have quoted your carrier.One example for bt below. And another one from t-mobile.

Go into Settings. Tap on General. Then tap Reset. Finally Reset All Settings. This oughta fix the issue

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