I change my phone number, Antiteft keeps sending SMS

Hi, I had a Galaxy S3 phone. I installed Avast Anti Theft for security reasons. 2 days ago, I changed my mobile and my mother is using my Galaxy S3 now. But ever since she put her sim card on my old Galaxy S3, Avast started sending 2 SMS’s everytime to the phone number I have defined previously. Since my phone is not stolen and the new phone number is safe, how can I disable this SMS sending.

Thanks for your help.

Hello,

please open Anti-Theft once to add the new SIM card to the list of trusted SIM cards.
This will deactivate the sending of SMSes.

Werner