I changed my sim card - how do I find which app is sending sms messages to my old number?
I am such an idiot.

A picture is worth a thousand words:



When I bought my device, about a year ago, I turned on the feature "SIM change alert - Send SMS when SIM card is changed". I completely forgot about it later, and it only came back to me today. Of course the recipients I defined were my own number and my wife's.

The lead I followed was @roxan's comment, which raised the suspicion about the mobile tracker app. A Google search led me to this forum post that describes this security feature, and when I read it I recalled that I turned it on.

Despite this incident, I actually still think this is an excellent feature that can really help in case my device will be stolen, but I just have to remember to turn it off before I change the SIM card myself...