TrackMyPhone collects device information such as their OS version, OS  type, model number, company name and much more. This slightly helps to  recognize you are monitoring the right suspect or not.   According to the need of the user, he/she can monitor more than one suspect through the same account. There is no need to change username and password. While installing the think spy on a cell phone you just need to enter old email address and password, now, you can access more than one device on the same account. 

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