Hello
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There are many i normally use one of these :
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if your father have iPhone i do not recommend the above ... They only work 100% with Android
My friend , i do not know if it is a good idea , but why you do not spy on her , you have 2 choices
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1- a private detective ( cost some good money )
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2- a spy device or app , you can get a GPS tracker and install it in her car or a mobile spy and install on her phone , you will track all her calls, sms , WhatsApp , location ext,, i can recommend android007 or spybunker it is your right to know in any way .
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