It is really so bad thing if iPhone was lost because it not only let you lose a mobile phone but also bring you potential danger once someone get your iPhone data. In order to prevent others obtaining your personal information from lost iPhone, you must lock the device as soon as possible. iCloud's Find My iPhone function can help you locate and lock the lost iPhone.
In fact, iCloud is the only online tool to lock your iPhone remotely and it is indeed effective. Now, let's begin to learn about how to lock iPhone if it lost.
Steps of setting "Find My iPhone":
1. Find and enter "iCloud" option under your iPhone's Settings Menu.
2. Input your Apple ID and password, sign in to iCloud.
3. Turn on "Find My iPhone".
Since your lost iPhone satisfy three conditions, now, it's time to lock the lost iPhone:
Step 1: Login in iCloud on computer browser, visit https://www.icloud.com. Input your Apple ID and password.
Step 2: Click “Find My iPhone” and retype Apple ID password.
Step 3: Waiting for iCloud to locate your iPhone.
Step 4: Enter iCloud, choose “My Devices”, select the device you have lost.
Step 5: Choose "Lost Mode" then according to the prompt, enter your mobile phone number and leave a message, lastly, click "Done".
Now your iPhone is already in lost mode.
After locking the lost iPhone is locked, and others can see your contact and message from your mobile phone, so that people who picked up your iPhone is easy to be in touch with you.