Mobile phone security advice
We provide mobile device users with simple, easy to follow advice to help minimise risk in the event of device theft, spam and malware
Smartphones and tablets now store as much sensitive information as desktop computers – but because we carry them everywhere, they face greater risk from theft, loss, and online threats. While using a mobile device is generally safe and straightforward, it’s important to take precautions. Our mobile phone security advice pages provide practical, straightforward guidance to help people reduce risks they may face – whether that’s preventing and responding to theft, blocking spam, or protecting against malware.
Core topics in mobile phone security advice
These pages provide detailed guidance on key areas of mobile security. Each section includes straightforward advice to help you stay protected:
Preventing mobile device theft
How to secure your phone physically, use tracking tools, and minimise your exposure in public
Spam and mobile devices
Understanding unsolicited calls and texts, and how to report or block suspicious content
Malware and mobile devices
How to avoid malicious apps and protect your phone from unwanted software or spyware
Secure use of voicemail services
Best practices to prevent voicemail hacking and keep your voice messages private
Quick mobile phone security advice
Mobile phone security advice: five quick tips to get started
Five practical mobile phone safety tips that help keep both your device and your personal data secure:
1. Switch on password protection
Make sure you have strong phone password security. Always use a strong PIN, password, or biometric lock (such as fingerprint or face recognition). Avoid predictable codes like ‘1234’ or birth dates.
2. Make sure lost or stolen devices can be tracked, locked or wiped
Enable tracking features such as Find My Device (Android) or Find My iPhone (Apple). These allow you to locate your device or erase its contents remotely.
3. Keep your device up to date
Operating system updates often include vital security patches. Don’t delay — install updates as soon as they’re available.
4. Keep your apps up to date
Out-of-date apps can contain vulnerabilities. Enable auto-updates where possible or check manually through your device’s app store.
5. Don’t connect to unknown Wi-Fi hotspots
Unsecured public Wi-Fi networks can expose your data to interception. Use your mobile network or a trusted VPN instead.
Protect yourself from mobile phone theft
Smartphones and tablets are valuable, portable, and frequently targeted by opportunistic thieves. Here’s how to reduce your risk:
- Be alert in public spaces: don’t leave your phone unattended on café tables, seats, or bags.
- Use your phone discreetly: if you’re in a crowded or unfamiliar area, avoid displaying your device unnecessarily.
- Keep it out of sight: when not in use, store your device securely in a zipped pocket or bag.
Device precautions
- Secure your phone: use your device’s security settings to prevent access if stolen. Strong passwords, PINs or biometric unlocks are essential.
- Get your IMEI number – Dial *#06# to display your phone’s unique IMEI. Write it down and store it somewhere safe. If stolen, this can help your operator block the device.
- Install or activate a tracking app – ensure your phone has location services and remote lock/wipe enabled. Familiarise yourself with how to use them in case of loss.
- Turn off message previews on the lock screen – this stops thieves from seeing login codes or personal info while the device is locked.
- Ensure you can still access your data – back up regularly and ensure you have recovery methods (e.g. alternative email or device for 2FA codes) if your primary device is compromised.
What to do if your phone is stolen
- Report the theft to your mobile network provider immediately
Ask them to block your SIM card to prevent unauthorised calls, texts, or data use. You may also be liable for charges until you report it. - Request device blacklisting if available
Some providers can block your phone using its IMEI number, rendering it unusable on local networks. Have your IMEI ready when you call. - Use a tracking service if it was enabled
If you have them set-up, try locating the phone using tools like Find My Device (Android) or Find My iPhone (Apple). If the device is still online, you may be able to lock or erase it remotely. - Report the incident to the police
File a report and request a crime reference number. This may be required for insurance claims. - Change passwords for key accounts
If you had apps or accounts accessible without extra authentication, update passwords for email, banking, and social media. - Alert your employer if it’s a work phone
If your device holds company data, notify IT or your security team. They may have policies for remote wiping or further reporting.
Supporting users and industry partners
The mobile industry is dedicated to providing the very best mobile phone security advice. GSMA supports consumers through awareness, and industry stakeholders through standards, research, and collaboration. Mobile operators, handset manufacturers and technology providers work together through GSMA programmes to improve mobile security, detect emerging threats, and coordinate global responses.
If you have a suggestion for additional security topics you’d like to see covered, please contact: security@gsma.com. If you have specific concerns about your device or account, we recommend reaching out directly to your mobile service provider’s customer service team.