How Do I Break Into Someone's Cellphone With Out There Passcode?

Unfortunately, unless you have an idea of what their code might be, you have no way of breaking into it unless you have the code. That is the purpose of a security code. Without doing a hard reset of the phone, you cannot get into the phone. A hard reset will return the phone to its factory settings, thus wiping any and all information you would be hoping to glean when you did manage to get into their phone.

However, depending upon the cell phone and the security software that is on it, it is possible. It is called Bluejacking or Bluesnarfing, using the Bluetooth functionality on the phone to send anonymous bluetooth messages from one phone to another. The recipient needs to have their Bluetooth turned ON and their phone set to be 'discoverable' (able to be found by other Bluetooth devices in range).

• Bluejacking
  

Bluejacking is usually harmless, but because bluejacked people generally don't know what has happened, they may think that their phone is either malfunctioning or has been broken into. Usually, a bluejacker will only send a text message, but with modern phones it's possible to send images or sounds as well.

• Bluesnarfing

Bluesnarfing is the unauthorized access of information from a wireless device through the phone's bluetooth connection, often between phones and computers. This allows access to the calendar, contacts, email and text messages, and on some phones users can copy pictures and private videos.

Bluesnarfing is a much more serious offense than bluejacking, but both exploit the Bluetooth connections without people's knowledge. Any device with its Bluetooth connection turned on and set to 'discoverable' may be susceptible to Bluejacking, and possibly to Bluesnarfing.

Therefore it is recommended that unless you have a need to keep the Bluetooth on, it is recommended it is turned off.