"Could Not Activate Cellular Data Network" in Messages App

I disabled my APN setting coz I don't want to use data network of my carrier for now.
Why do I get the error "Could Not Activate Cellular Data Network" when I go to Messages? It doesn't use data connection or internet connection since its only SMS. The pop-up error message is irritating me. Makes me think that something in Messages App also eats data in the background for some reason.

Try to switch Off mms service ...
mms uses data !

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    Message was edited by: r.spiroski

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    All iPhones sold in Japan are sold carrier locked and cannot be officially unlocked by the carrier. If you unlocked it, it was by unauthorized means (hacked), and support cannot be given to you in this forum.
    Hacked iPhones are subject to countermeasures by Apple, particularly when updating the firmware. It is likely permanently re-locked or permanently disabled.
    Message was edited by: modular747

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