1. If you lose your phone, go to the registered site (where you opened the account to locate the mobile) via laptop , tab or smart phone without delay, locate the lost phone , ring it , lock the phone , take backup or phone if necessary . You can delete data. You can also give some good-medium to catch the thief. I don't think a thief should be killed. It is not his fault that he stole, it is the fault of the nation, it is the fault of the government , the builders of the society of which you are one. Even if the phone is not stolen, if it is stuck somewhere and you can't find it , there is no reason to worry. 2. Make a GD at the nearest police station to get help from the police after the phone is lost. If the answer to the first two questions is ' yes ' , then if you press and hold the power button, if your phone is turned off or its battery is opened, then your mobile is not safe. If it is in the hands of a thief, he can stop it immediately. As a result, there is no way to locate the phone. However, in order to locate, do everything I have said above. There is no such thing as your thief being intelligent. So with good luck you (if the thief can't change any of your settings) will be able to locate the phone yourself. And if you can't locate it, wait until a new SIM is inserted in the lost phone. The anti-theft locating service site or app will send you the number of any SIM used in the iPhone. You can use that number to track a thief or your phone holder and you can recover it with the help of the police or in your own way. Even if you don't get the number used in the set, then the police is your only option. Even if IMEI No. All right. Nowadays it can also be changed. If the thief has this idea you will never get the phone. The thief turned off the mobile first. Then take him to a store and route him. Finally the IMEI No. of the mobile. Change can make it completely your own. Note IMEI No. Change is completely illegal. So it is very dangerous for thieves to buy mobile phones. IMEI No. with someone . You will be in danger if it becomes duplicate. Because you will not have any purchase documents. There is no way to prevent the phone from shutting down if the phone is shut down directly (without the power menu) with the power button. It cannot be prevented with any app. Because it is a hardware function. However, there are many mobiles so that the phone can not be turned off directly by pressing the power button. For example, when I hold the power button on my Samsung phone, it does not stop but restarts. If you buy a mobile phone that has no way to turn off the power button directly, the battery can be opened , in which case you can attach the back cover with superglue. It will confuse the thief. He may refrain from forcibly opening it for fear of breaking. Then he can catch her before she asks for help from any store. Needless to say, it will not have a warranty on your mobile. If there is no warranty you will definitely do it.