Been having a battle with my cell provider for “Pay per Use” texts for the last 2 months. Turns out avast keeps sending an SMS message to 420720001669. A total of 12 texts last month and 3 so far this month.
Found an equally good antivirus to replace Avast that I don’t have to worry about “Pay per Use” texts being sent without my knowledge.
BEWARE!!!
AMS/Anti-theft only sends sms’s if needed and does it according to the settings you have made/agreed with.
You can enable/disable the sending of sms’s as you like.
Here is just one of the many web-pages that tells you how you can prevent it.
https://blog.avast.com/2014/07/02/how-to-prevent-unnecessary-costs-of-avast-sms-notifications-when-replacing-your-sim-card/