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How to encrypt a cell phone

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How to encrypt a cell phone: Whenever you are at home, you are surrounded by small children: your grandchildren and your younger siblings often come to see you and they struggle to understand the concept of privacy. They prove attracted to your super technological mobile phone, but then you surprise them by browsing through the photos. Well, if things are the way I described them or you are in a similar situation, I can absolutely understand why you are looking for a solution to encrypt a cell phone : you want to keep your photos and videos for yourself and you don’t want to let others know which apps you install.

How do you say? I took it 100% but you are a little worried because you are afraid that performing this type of operation is long and complicated? But no, don’t worry, it’s not at all! To encrypt a mobile device, there are several options and, in this tutorial of mine, I will tell you about those that can be performed even by the less experienced, so that you can easily succeed in your intent.

Are you ready to start? All you need is a few minutes of free time: sit comfortably, take your trusty smartphone in your hand and pay attention to the indications that I will give you in the following lines. I am more than sure that, if you carefully follow the procedures of this tutorial, you will succeed and will be happy to share these tips of mine also to friends in need of a similar advice. Let it bet? Now just chat; let’s get down to business! I wish you a good read and make you a big good luck for everything!

How to encrypt a cell phone with a password

The first method you can use to encrypt a mobile phone is to use a default setting, which automatically encrypts the contents of the phone when you set a code or password for the lock-screen (the lock screen).


To encrypt a recent Android device with a password , you need to open the Settings app (the  gear symbol located on the main screen), then press the wording Security and go to Lock screen .

Then refer to the options Scroll , Voice block sequence, PIN or Password , to choose the option you want to set; tap on it (for example PIN ) and then type the sequence you want to use to lock the screen. Then press the Continue button , confirm the PIN, typing it again, and press the OK button .

If you are asked how you want to manage the display of notifications, choose whether to show all the contents of the notifications ( Show all the contents of the notification ), hide the sensitive contents of the notifications ( Hide sensitive contents of the notification ) or indicate if you want the notifications not are displayed ( Do not display notifications at all ). Confirm this operation by placing a check mark on the item you prefer and then tap the Finish button .

From the Security menu , you can also customize the lock set, choosing the period of time after which the screen is automatically locked ( Automatically lock ) and the ability to lock the device by pressing the power button ( Lock ignition contact ).

If you use a device equipped with an older version of Android, setting the unlock code will not automatically encrypt the contents of the device memory. To activate data encryption, you need to go to the Settings> Security menu  and select the item to  encrypt your phone . The operation will last quite a while and, consequently, it is advisable to carry it out while the smartphone is connected to a power source.

Note: from the moment when I am not aware of the model and version of the operating system of your Android device, the procedures just indicated may vary: smartphone manufacturers are in fact used to customize the operating system developed by Google.


Using an iPhone equipped with  iOS 8 or later, you have the option to encrypt your mobile phone, setting a password, or you can configure the Touch ID , to unlock the device, using a fingerprint. IPhone models equal to or later than X also have Face ID , which allows you to encrypt your device through facial recognition.

To configure the Touch ID, the Face ID, a PIN or a password, press the Settings app icon ( gear symbol from the home screen), and then tap on the Touch ID and Code item and finally on the word Enable code .

Select the code that you use to unlock your device (you may customize it, by tapping on the word code options and choosing between customized alphanumeric code , personal numerical code or four-digit numerical code ) and type it twice in a row; to finish, enter the password for your Apple ID, for confirmation purposes, and press the Continue button . Don’t forget to tap on the Request Code item , to set the request time for it.

With the code set, also choose whether to configure the Touch ID of your device, to unlock it by fingerprint. To do this, tap on the Add a fingerprint item ; you are asked to place a finger on the Home button several times in succession, so that your fingerprint is registered, and also to follow the instructions on the screen, adjusting the grip. If you have set up a fingerprint, refer to the item Use Touch ID and move, if you wish, the lever from OFF to ON , corresponding to the words Unlock iPhone and iTunes Store and App Store .

If you have an iPhone X or later, you can set the Face ID by going to Settings>  Face ID and code , typing the unlock PIN of the device (if set) and tapping on the appropriate item. If you want to know more information on how to configure the Face ID, read my guide , in which I explain how to do it.

How to encrypt mobile photos and videos

Do you want to be sure that all the photos, videos and files contained within your device are safe from prying eyes? In this case, you can choose to take advantage of additional protection, using apps that play the role of virtual safe to encrypt photos and videos .

In this regard, I suggest you use the KeepSafe application , which is available for free on the Android Play Store and on the iOS App Store . The application is one of the best of its kind: it allows you to hide the photos and videos on your device quickly and easily and to make them visible only after entering a customizable password.

Then download it from the virtual store of your device (on Android presses the Install button and the Accept button ; on iOS tap on the Get and Install item , entering the password of your iCloud account, using the Face ID or placing your finger on the Touch ID , for confirmation purposes). Then start the app by pressing on its icon, and follow my instructions to configure it.

On Android , press the Allow access button and then Allow . Then register an account by clicking on Are you new? Register here . Then follow the on-screen procedures: you must configure the account by choosing a PIN and indicating an email address to be used for registration and for the recovery of the code; then presses the Finish button .

On iOS the configuration procedure requires that you tap on the Create an account button , then on the Create item , after entering your name and email address , and finally on the OK button . Now, tap on the item Later and choose an access code for the app.

From now on, the procedure for using the app is very similar on both devices. To add multimedia elements to the virtual safe, press the (+) button and tap on one of the options on the screen: Import photos  to import a photo from the device memory; Take a photo ( Camera on iOS) to upload a currently taken photo or  Add an Album ( New Private Album on iOS) to create an album and add media items. In addition, only on iOS, there is the wording Add File, which gives the possibility to archive a document. Once you have selected the images to be imported, tap on the Import button .

KeepSafe is free but, the first time you log in, you are offered the opportunity to try the subscription version,  KeepSafe Premium , for 31 days. At the end of the trial period, you can still use the application as a virtual safe, but you will have to subscribe to the subscription to take advantage of all the additional features. These include, for example, the possibility of using the integrated cloud storage service for backup, intrusion warnings (the app takes a photo, through the front camera, in case of repeated intrusion attempts), forgery Access PIN (an additional security option) and additional themes (aesthetics for customizing the app).

To learn more about using the KeepSafe application , and to learn more about the protection of multimedia elements via the app, I refer you to reading my dedicated guide . In the link indicated you can find detailed information on other applications similar to KeepSafe , which you can download on Android and iOS devices.

How to encrypt cell phone applications

Encrypting cell phone applications is an advanced procedure which, most of the time, requires the use of a device with root permissions (Android) or with jailbreak (iOS). On Android devices, however, there is a solution that can be used in a simple way and that does not require root permissions: now I’ll talk about it in detail.


If you use Android, you can use the free application  Norton App Lock : it is a  tool developed by the famous antivirus software company, thanks to which it is possible to block access to applications with a personalized code, all in a very simple and fast.

To use Norton App Lock, download the application from the Play Store , pressing the Install button and then the Accept button , then, at the end of the download, tap on its icon, to start it. From the main screen, choose whether to put a check mark next to the item that refers to the possibility of participating in the Norton Community Watch security program , by sending data and then presses the Accept and start button .

Configure the app by tapping the Configuration button and, in the Accessibility section , locate the Norton App Lock Service item ; press on it and move the lever from OFF to ON , and conclude by pressing the OK button . Now set a code for unlocking and press the Continue button .

Through the main screen, you can lock the applications you want to protect: press the button with the padlock symbol , corresponding to the icons of the apps to be locked (make sure you are on the green and yellow screen). Are you in the gray section? It’s not a problem: select the applications and then tap the button with the padlock symbol at the top, to block the selected apps.

Then test the application, starting the apps you have blocked: as you can see, it works very well even without root permissions and, the apps you have selected, cannot start, if you do not type the unlock sequence.


IOS devices  integrate a native functionality called  Time of use , which allows you to prohibit access to certain system apps (e.g.  Safari or  Mail ) and third-party applications that belong to certain categories, such as  Social Networks or  Games .

To use it, go to the iOS Settings menu  (the gear icon located on the home screen), go  to Use time , select the item  Use “Use time” code  and set the PIN you want to use to block the access to apps.

When the operation is completed, go to  App limitations , type the PIN set above, press on the Add usage limitation  item  and choose the category of app to block between  Social networksGamesCreativityEducation etc. Then set the timer for the usage times to 0 hours and 1 min (the minimum possible), go to  Customize days and choose which days of the week to apply the block.

Mission accomplished! Now go back, open any of the blocked apps and wait a minute: a screen will appear where you will need to enter the unlock PIN to go back to using the blocked applications. If you have second thoughts, you can revoke the block by going back to the Settings> Use time> App restrictions> [blocked apps category]  menu  and pressing the Delete limitation button  .

To set the system apps block instead, go to  Settings> Time of use>  Content and privacy > Allowed apps and choose which apps to allow or block. To set age limits, instead, select the  Content Restrictions> Apps options .

If you use an iOS version equal to or earlier than 11, you can only take advantage of the Restrictions  for blocking some system apps and inhibiting applications not suitable for certain age groups. To take advantage of it, tap on the Settings app ( symbol of a gear ) on the General> Restrictions items and then press on Enable restrictions . Then set a code, enter it twice in succession and then move the lever corresponding to the apps you want to hide from ON to OFF .

Unfortunately, in this section, only the predefined applications can be hidden: SafariCameraSiri and Dictation, AirDrop, CarPlay and iTunes Store . If you want to hide third-party applications instead, you can set an age limit for their use. To do this, tap on the App item and then affix the check mark at the age limit, for example 4+, to set the age limit for children with at least 4 years.

The block is to hide apps that have been categorized in the App Store, according to a minimum age limit. So it is not possible to manually hide a single third-party application, but only all those that have a specific age limit.

If you want to deepen the topic, I recommend you read my guide on how to hide apps and the one dedicated only to Android devices, in which I also told you about the possibilities offered to devices with root permissions or with jailbreak .

How to encrypt a cell phone number

Would you like to  camouflage your cell phone number to play a phone  joke on a friend or to protect your privacy, but you don’t know how to do it? Quiet, I can also help you in this case; read the following instructions carefully.

All you have to do is use the anonymous call code # 31 #  which works indiscriminately on all devices and for all national telephone operators, allowing you to make a call at no additional cost to those provided by your operator.

To take advantage of this code, start the dialer of your device (it is the app with the symbol of a handset ) and, before calling the number, put the code  # 31 # . For example, if you want to call the number  123456789 , you have to dial the number  # 31 # 123456789  and start the call by pressing the button with the handset symbol . In this way, whoever is on the other side will not see your number appear, but the wording  private  or  unknown number .

Obviously, the blackout number only affects the person you are calling. Do not use anonymous calls for illegal purposes; the telephone operator can trace the identity of the caller and can trace the users, who make use of it without knowledge of the facts.

If you want more information on how to make anonymous calls, I advise you to deepen the topic, reading my dedicated tutorial .