Limitation of Find my iPhone

I recently had misplaced my brand new iPhone 5 and it was turned off when I tried to call it using another mobile phone. I tried to locate it using Find My iPhone App and using it from iCloud, but it was offline.

Normally, most people will report lost phone to the telco and telco will temp suspend the phone line, users will then get a replacement SIM and it further disabling the tracking function of Find my iPhone.

I strongly believe that Apple should improve Find My iPhone App especially when dealing with a savy thief. He/she simple turn off the iPhone or take out the SIM card disabling the tracking facility.