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htc phones) The secret code of the important things that offered by smartphones and corporate tablet in general, where through a secret code you can learn about a lot of hidden details about the screen and the camera and testing of touch, vibration, handsets and many other things which will be able to see whether the phone this is worth buying or not specifically if this phone is used. In this article we will review your three BB confidentiality is very important for all Samsung devices and mobile phones and Sony htc, which will be able to find out the main problems and defects available in the phone before buying. Samsung Company : You open your contact list on the phone like you make a call and then you write this code (# * # 0 *) from left to right and then click Connect. A new window appears from which you can learn the selection of screen clarity, touch, vibration and speakers front and rear camera smartphone or device and camera to your tablet. htc company: Open your contact list and write this code (* # * # 3424 # * # *) from left to right, so the code will be able to choose and know the sound and the screen and battery quality and a lot of other details about the phone from htc company. Sony: From the contact list you write this code (* # * # 7378423 # * # *) from left to right, which you can test your keyboard and touch screen speakers and the display and alarm lights and more.