There are some scenarios in which a person who does not know who is calling just called the wrong number, so be sure not to spend money on just the wrong number. Another great use for this is actually finding out who called the house looking for her lover, etc.
There are some relationships where people are unsure of your lover at the time, and simply want to understand if their lover is having an affair on them or not, by quickly finding who is calling house or their cell phone number - you can quickly find out who called and whether or not to be aware of the situation, or if your paranoia
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