What is the best spy mobile service?

Hi, friend! Is there any one who can suggest which mobile spy service is reliable? It must be free. I don't want to spend money on it. Thanks.

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iKeyMonitor Mobile Spy Key logger - Run in stealth, invisibly SPY.

• Spy on websites visited
• Spy on SMS, WhatsApp Msg
• Spy on Keystrokes, Passwords
• Send the logs to you by Email/FTP
• Spy on Facebook Msg, Skype, IM+, Kik, Viber... and more...

For iPhone, iPad, iPod Touch: Download in "Cydia" for Free - 100% FULL Functional !

For Android, BlackBerry, Windows Phone, Symbian: Get Mobile Spy - Cell Phone Spy !

What does spy service mean?