Hacking ur own phones

I have mobile's which i gifted it to my girl friend and since past few weeks i don't know about her whereabouts, i know all her gmail, yahoo passwords & Imei no of all the three phones i gave her from which one is Iphone 5, Samsung S5 & Samsung Tab 3. can anyone help me in following up all the details i need. would be glad to pay for the service offered for my needs. thanking you. Prince