Find answers to two questions when buying a mobile. 1. If you hold down the power button for ten seconds, does the mobile turn off ? 2. Can the battery be opened ? If the answer to both of these questions is ' No ' , then if your smartphone is stolen, you can catch the thief yourself. However, the thief must be caught within an hour of the theft. If it is late, the intelligent thief will root the phone (gain the ability to change the mobile's operating system). And he will not keep any of your settings. And if the answer is "yes" then it is better not to buy such a mobile. If such a mobile thief is caught, he can easily turn it off. As a result, you can't locate him or the mobile.