How to spy mobile

What if you have already given them the new phone can you just buy another Samsung and complete the download as you say above and still access the information you need.

Free Text Message Spy

How do I install on android? Do I need phone? Is not jailbroken and has pw, so if I need phone I only have but a short time to do what needs to be done. Is it hidden? Does anyone know what other spy app offers disguise download besides spyhide? Well she just found out that I knew about a minute phone conversation that she had and blocked me. What would you recommend I do now?