If you find any numbers on your partners' cell phone that are suspect, you can use the "reverse phone lookup search" to discover all the information about the person. Their address, name, family, and many other details. You will know exactly who the person is.
Use A Tracking Device-
This costs a little bit more. But if you are determined to find out how to catch a cheater who it is, you can buy a GPS tracking device, and place it somewhere hidden in their vehicle. Once you have placed the device in their car, you can check their exact position from your computer. If you used the "reverse phone lookup service", you will have the address of the person you expect. You will be able to see exactly what address your partner is at with the GPS device.
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