For Those Who Have Yet to Lose Their Phone
Not having lost a phone yet is a blessing and those who have not, should not take this for granted. Just ask someone who has and is unable to locate it due to not having taken the right steps.
The best way to secure a phone is to install one of many available applications in the market, which not only act as an antivirus but also have a built-in option of tracking the phone in stealth mode whenever the SIM card is changed in the device.
Most are free, but some require a one-time payment to be made and guarantee that a phone will be located if it is stolen in any case.
For Those Who Have Lost Their Phone
Losing a phone is a very difficult time to go through. If it is stolen or lost, either way, there is still hope for it to be recovered especially if there is a GPS tracking device built-in.
The best way to go about it would be to contact a telecommunication company which could track the phone through the IMEI number and find its location or if that is not an option, registering a theft with the police will be of help as well.
Tracking the Phone with Security Software Installed
If you have one of the many available anti-theft apps installed on your phone, there are numerous ways that the device may be located. Some have options to access and manipulate the device through special codes if they are emailed to a server while some apps will automatically alter the owner once the SIM card is changed through a backup phone number or email.