Because your iPhone may contain sensitive and confidential information (especially if you are using LonelyID), you must be sure you keep your iphone protected against any loss or forgetfulness.

A useful way to protect and secure access to your iPhone is using the 'Passcode lock' functionality.

You may follow these steps to activate the passcode lock:

1. Go to:  Settings> General> Passcode Lock
2. Enter a 4-digit PIN and that's all! Your iPhone is now protected against theft.

If you do not like having to enter the password each time your iphone is locked, I recommend you to configure your iPhone to request the passcode only one hour after last use (in the same section "Passcode Lock" there is an option called: Require Passcode  After 1 hour). So, in normal use, the passcode will only be requested once and when you stop using your iPhone the passcode will be requested again after one hour. Very practical.

If you think a 4-digit passcode is not sufficient to protect your data, you can also activate the option 'Erase Data' which will be responsible for removing the data from your iPhone after 10 failed attempts when introducing your code.

Remember synchronize your iPhone with iTunes frequently to avoid any loss of information.