How To Encrypt Your Android Or iPhone

Keeping your data safe is more important than ever. Our phones store everything from personal photos and messages to financial details and work files—data we’d never want in the wrong hands.

One powerful way to protect this sensitive information is through encryption, which scrambles your data into an unreadable format that’s useless to anyone without the proper key to decode it.

When it comes to phones, there are two essential types of encryption you should know about:

• Device encryption, which protects data stored on your phone itself.
• Communication encryption, which secures your active exchanges—like calls, texts, and emails.

While most newer smartphones have device encryption enabled by default (though it’s crucial to verify this), many users completely overlook the importance of encrypting their communications, leaving their conversations vulnerable to interception.

In this guide, we’ll walk you through checking your phone’s storage encryption status, explore secure communication methods, and share additional strategies to strengthen your overall digital security.

What Is Phone Encryption?

The encryption process works by scrambling your phone’s data into a complex, unreadable format.

When you unlock your device using a screen lock or biometric feature, the encryption key is applied, converting the data back into its original, accessible form.

Without this key, the information remains scrambled and indecipherable, protecting it from unauthorized access.

For example:

• Unencrypted data: “YourPassword123”
• Encrypted data: “XKq2@dOe91LxYz&”

Encryption safeguards nearly all the data stored on your phone, including:

• Photos and videos
• Messages and emails
• Saved passwords.
• Payment information
• App data

Is Your Phone Already Encrypted?

The good news is that most modern smartphones have device encryption turned on by default, as long as you’ve set up a screen lock.

This ensures your data is scrambled and protected from unauthorized access. If you don’t have a lock screen enabled, your phone’s encryption won’t be active, so it’s an essential step for securing your device.

Here’s how to set up a screen lock and confirm encryption on both iPhones and Android devices.

iPhone

Apple automatically encrypts all iPhones (since iOS 8), but this data protection only kicks in when you enable a screen lock. Follow these steps to set it up:

1️⃣ Open Settings:
Go to Settings > Face ID & Passcode (or Touch ID & Passcode on older models).

2️⃣ Set a Passcode:
If you haven’t set one, you’ll be prompted to create a six-digit passcode. You can also choose an alphanumeric code or custom-length numeric code.

3️⃣ Enable Face ID (Optional):
After setting your passcode, follow the on-screen instructions to set up Face ID to add an extra layer of security.

Android

Most Android phones also come with encryption enabled by default (since Android 6.0), but this requires a screen lock to work. Here’s how to encrypt your Android device:

1️⃣ Open Settings:
Go to Settings > Security (or Privacy, depending on your phone model).

2️⃣ Choose Screen Lock:
Select Screen Lock or Lock Screen and choose your preferred method:

• PIN
• Password
• Pattern

3️⃣ Set Your Lock
Follow the prompts to set up your lock method. For maximum security, choose a PIN or password over a pattern.

4️⃣ Enable Biometric Unlock (Optional):
Many Android devices also let you set up fingerprint or face unlock for convenience.

Encrypted voice and video calls

Traditional phone calls are not encrypted, leaving them open to interception. Instead, use secure VoIP apps to protect your conversations.

ℹ️ Apps to Use:

• Signal and WhatsApp: Both offer encrypted voice and video calls across Android and iPhone.
• Silent Circle: A privacy-first communications app for both Android and iPhone.
• FaceTime (iPhone only): Provides end-to-end encryption for voice and video calls between Apple devices.

Encrypt your emails

Standard email protocols often lack robust encryption, but you can secure your email communications with these methods:

ProtonMail

1. Download the ProtonMail app from the Google Play Store or App Store.
2. Create an account by choosing a username and password.
3. Compose emails securely using ProtonMail’s built-in encryption. For non-ProtonMail recipients, use the “Encrypt for Non-ProtonMail Users” option and set a password.

K-9 Mail with OpenKeychain (advanced Android option)

K-9 Mail is an open-source email client for Android that, when paired with OpenKeychain, enables PGP (Pretty Good Privacy) encryption for existing email accounts. This setup provides an alternative for users who want more control over their encryption setup.

Here’s how to set it up:

1️⃣ Install K-9 Mail and OpenKeychain from the Google Play Store.

2️⃣ Set up your email account in K-9 Mail

• Open K-9 Mail and select Add Account.
• Enter your email credentials and server settings (POP/IMAP and SMTP details).

3️⃣ Configure OpenKeychain

• Open OpenKeychain and generate a new PGP key pair (a public and private key).
• Share your public key with people you email to enable encrypted communication.

4️⃣ Link K-9 Mail with OpenKeychain

• In K-9 Mail, go to Settings > Account Settings > Cryptography.
• Select OpenKeychain as the encryption provider.

S/MIME Encryption (advanced iPhone option)

While iCloud Mail doesn’t support end-to-end encryption natively, you can enable S/MIME (Secure/Multipurpose Internet Mail Extensions) for secure email exchange.

Here’s how to set up S/MIME:

1️⃣ Get an S/MIME Certificate

• Purchase or request a S/MIME certificate from a trusted provider like GlobalSign or DigiCert.
• Once you’ve received the certificate file (typically in .p12 or .pfx format), install it on your iPhone.

2️⃣ Enable S/MIME for your email account

• Once you have installed the certificate, Go to Settings > Mail > Accounts.
• Select the email account you want to encrypt.
• Tap Account Settings > Advanced > S/MIME and toggle it to On

Enable RCS with Encryption (Android only)

Rich Communication Services (RCS) is a text-based protocol for mobile devices, designed to replace SMS and MMS messaging.

Google Messages supports RCS and provides end-to-end encryption for one-on-one conversations when both users have chat features enabled. Here is how to enable this feature on your Android smartphone:

1. Open Google Messages
2. At the top right, tap your profile picture or icon
3. Select Messages Settings
4. Tap RCS chats
5. Toggle RCS chats on or off.

Improve your privacy on social media

While many social media platforms don’t fully support encrypted messaging, you can improve privacy with these steps:

• Use encrypted chat features: Platforms like Facebook Messenger offer end-to-end encryption for private chats.
• Enable Two-Factor Authentication (2FA): Add an extra layer of security to your social media accounts.
• Adjust privacy settings: Limit who can view your messages, posts, and profile information.

Alternative Option: Encrypted Phones

Encrypted phones can offer superior security and privacy compared to standard smartphones through specialized hardware and software. Examples include:

• Purism Librem 5
• Bittium Tough Mobile 2
• Silent Circle Blackphone

Here’s how an encrypted phone can protect sensitive data:

• End-to-end data encryption: Secures calls, messages, and data, preventing eavesdropping.
• Secure operating systems: Reduce vulnerabilities with limited third-party apps and strict permissions.
• Hardware security: Includes tamper-proof hardware, encryption chips, and kill switches for microphones and cameras.
• Secure communication apps: Come pre-loaded with apps for private messaging and calling.

Although beneficial for certain industries handling sensitive information, a properly configured modern iPhone or Android device offers sufficient security for the average user.

Additional Tips for Keeping Your Phone Secure

Even with encryption, there are other steps you can take to enhance your phone’s security and protect your data:

• Set a strong passcode: Avoid easily guessable PINs like “1234” or “0000.” Use a longer alphanumeric passcode for better protection.
• Update your operating system: Regular updates fix known security vulnerabilities. Ensure your phone’s software is always up to date.
• Use a VPN: Protect your internet connection, especially on public Wi-Fi networks, by using a trusted VPN to encrypt your online activity.
• Avoid jailbreaking or rooting: Jailbreaking or rooting removes your phone’s built-in security protections, making it more vulnerable to malware and hacking.
• Enable remote wipe: Set up features like Find My iPhone or Find My Device to remotely erase your data if your phone is lost or stolen.
• Scan for Spyware with Certo: Even with encryption, spyware or other malicious software could compromise your privacy. Use Certo AntiSpy for iPhone and Android to detect and remove threats.

Final Thoughts

Encryption serves as your first line of defense in safeguarding personal data and communications. By ensuring both your device storage and communications are encrypted, you create a comprehensive shield for your digital life.

While most modern smartphones offer built-in device encryption, taking the extra step to secure your communications through encrypted messaging apps and email services closes critical security gaps. Remember that unencrypted calls, texts, and emails can be intercepted regardless of how secure your device itself might be.

For complete protection, combine encryption with other security best practices: use strong, unique passwords; enable two-factor authentication; keep your software updated; and periodically scan for malware. These layers of security work together to keep your private information private.

Ultimately, the small effort required to implement proper encryption pays enormous dividends in protecting everything from personal photos to financial details—ensuring your digital privacy stays in your control.