Thank you for reaching out to our Community Forums! I understand how inconvenient sending duplicate texts can be, but not to worry. We will get this taken care of!
Duplicate texts can be the result of an issue with connecting to a nearby tower. You can try removing and reinserting your SIM card to reestablish your connection to a tower.
To do this you can use our Device Support Tool! All you have to do is select your make and model device, then select View All Solutions. After this, select About your device under Device Topics on the left side. Lastly, pick Insert SIM & Memory Card. Please, make sure your device is off when you do this.
Confirm if this issue exists only with the default messaging app or a third-party one. If the app is third-party make sure it is up-to-date by checking it in the Google Play Store.
You can also try turning Advanced Messaging off. Though this has cool features, it can also interfere with some of the basic functions. To do this go into your Messages App > Select the 3 dots > Settings > Advanced Messaging > Off.
I hope you found this useful. Have a great rest of your day!
Jordan, AT&T Community Specialist
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*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.