Best application to spy on phone?

Mspy apps is good but a paid one which provides Ultimate monitoring for parental control....

Try super point spy. It is Available for both Android and iPhone devices, this #1 cell phone tracker app is both inexpensive and user friendly..

FlexiSPY is one of the most feature-rich and powerful cell phone spy software I’ve tested.

Here’s what it does:

Live Call Intercept: Intercept a phone call and listen in on the conversation.
Record Phone Calls: Remotely record all phone calls they make and receive on their cell phone. All call recordings are uploaded to your FlexiSPY control panel as MP3s.
Record Surroundings: Remotely activate the microphone on their phone and hear what’s really going on. You can also record their phone’s surroundings at any time. All recordings are uploaded to your FlexiSPY account.
RemCam: Remotely activate the camera and take a secret picture to view the phone’s surroundings.