There is something wrong with texting on the mobile phone.

Did you just change your calling card? This should be related to an anti-theft tracking function of the mobile phone itself. Change another card after setting it up, and the phone will be sent to others all the time. The content is that I am using your mobile phone. I don't know what model you can't operate, but what is certain is that there is nothing wrong with the mobile phone itself. You can find this function in your mobile phone settings, or you can take your mobile phone to the seller or customer service and ask them to help you solve it.