Iphone 5 not recieving calls. I'm on 02?

Basically I'm sending the messages and the people receive them.
But I'm not getting their messages when they reply to me.
What's wrong? How can I fix this

Maybe you don't have an SMS plan? The free apple to apple chat only works in Wi-Fi. Try a soft reset or a hard reset too.

soft reset. Hold the power button till you see the reset screen.
hard reset. Hold the power button and the home button till it shuts off.

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