If your concerned about it getting stolen, go to settings, enable restrictions, make a pin, DON'T allow changes to location and accounts. This basically stops people from disabling tracking your phones position. Make sure under locations that find my iPhone is on.
Only annoying thing is any app that requires location services, you'll have to go to location services then turn it on.
Other than that, you can track your phone down and if someone stole it, call the police and use find my iPhone to get your phone and arrest a thief.
Bonus to find my iPhone (iCloud.com or spouses iPhone) you can tell it to play sound if you misplaced it in your place, even if your sound is turned off.
Edit--
Reason to disable accounts is because you need to enable find my iPhone under iCloud. Don't want someone to simply turn that off.