On my iPhone, the iMessage option is greyed out, and so is my phone number, why??

whenever I go to the "messages" setting on my iPhone, it shows imessage greyed out where I cant click on it to turn it on or off, and also my phone nu

whenever I go to the "messages" setting on my iPhone, it shows imessage greyed out where I can't click on it to turn it on or off, and also my phone number.

or:whenever I go to the \"messages\" setting on my iPhone, it shows imessage greyed out where I can't click on it to turn it on or off, and also my phone number.

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