Lock your Smartphone Immediately
The first thing to do is to lock your Smartphone so no one else can use it. Use a computer or ask someone for help. With applications such as «Find My Device» you can lock it and display a message on the screen. This prevents strangers from accessing your photos, messages or social networks.
Change your smartphone passwords
Update the passwords of all your important accounts such as email, social networks and online banking. This is vital to prevent someone from stealing your information. Although it may seem tedious, this step protects your sensitive data. Do it from another smartphone, a computer or tablet.
Track your Smartphone
If you have location enabled, use tools such as «Find My iPhone» or «Find My Device». These show you where your phone is. Sometimes, you can make it ring to locate it if it's nearby. If it shows up in a strange place, notify an adult or the police.
Inform your telephone company
Call your phone service provider to have your line suspended. This prevents someone from using your number to make calls or send messages. They can also help you retrieve your number when you get another device. It's a simple but crucial action.
Remote wipe smartphone data
If you can't recover your phone, delete everything on it from the internet. Functions like «Erase device» on iPhone or Android delete your data. Even if you lose photos or contacts, it's better to protect your privacy. Better safe than sorry.
File a Complaint
Go to the police and explain that you lost your phone. If you have the serial number (IMEI), give it to them. This helps track the device in case someone tries to sell it. Having a report is also useful for insurance claims, if you have any.
Use a Backup Next Time
When you get a new phone, activate automatic backups. That way, if you lose your phone again, you won't lose all your information. Also use strong passwords and enable fingerprint or facial recognition locking. These measures are preventive and very effective.
Losing a smartphone can be stressful, but with these steps, you will protect the most important thing: your personal information.

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