Are you making use of any application in your phone? because see no matter which OS or which phone we are using but it can happen to every mobile, and once i was also having the same problem with the phone and lately i came to know that it was happening only because of the application i had installed in my machine. thus simply after reinstalling the application everything were working perfectly in the phone and i was able to make use of the text messages again in the phone. thus according to me you can have two options over here as you can simply either reinstall the application as what i have done or simply uninstall the application make use of default feature for sending messages through the phone.
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