To get to the point, these signs predate the common use of one single item. If you partner carry around their mobile or cell phone like a body part, this is the number one red flag.There are also other obvious signs such as coming home late, poorly explained reasons for bieng unreachable, bieng irritatble with you for no reason and generally spending less time at home.
You can watch how it works in this You Tube Tutorial.
Keep in mind that finding these will give you information but will not fix the issues in your marriage.
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