Iphone 5 not receiving text messages from other iPhone?

Ir receives iMessage perfectly fine when I'm connected to Wi-Fi but when I don't have Wi-Fi I turn iMessage off and switch to text but when I do that I NEVER get the other iPhone's messages until I switch onto Wi-Fi with iMessage. Why is it doing this? If I turn cellular on then it automatically switches to iMessage and I don't want it to do that, I just want to TEXT.

Added (1). And it's on the "send as sms when imessage isn't available" setting too.

Sounds like a problem with your carrier

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