Before you decide on which mobile spy system you are going to use you
ought to consider the system's compatibility with the target host phone.
This is because not all spyware systems are able to work in all the
mobile phones. The systems are made for use in particular sets of mobile
phones. Thus you will have to find a system that is able to work with
the target mobile phone first. You can easily find information about the
system requirements for a particular spyware software by going
through its specifications. Afterwards the you can then make a decision.
Sources:
iPhone Location Tracking
Find iPhone Location
Tracking iPhone Location
Trace iPhone
Track iPhone Location