New Sim Card message

After inserting a sim card for my cel phone I later uninstalled Avast to test another anti-virus product. I am receiving messages on another phone advising of the sim card change and I would like to know how to discontinue the sim card change notice.
Thank you…

Did you uninstall both avast! Mobile Security AND avast! Anti-Theft?
Did you install avast! Anti-Theft with a disguised name? You need to uninstall this disguised application (removing the “admin device” flag before).