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how to change passcode using "find my iphone" i...

hi, I've lost my iphone with a passcode but whoever has stolen it already knows my passcode, so is it possible to change the passcode using "find my iphone" in this state??

What To Do If Your iDevice Is Lost Or Stolen

If you activated Find My Phone before it was lost or stolen, you can track it only if Wi-Fi is enabled on the device. What you cannot do is track your device using a serial number or other identifying number. You cannot expect Apple or anyone else to find your device for you. You cannot recover your loss unless you insure your device for such loss. It is not covered by your warranty.

If your iPhone, iPod, iPod Touch, or iPad is lost or stolen what do you do? There are things you should have done in advance - before you lost it or it was stolen - and some things to do after the fact. Here are some suggestions:

This link, Re: Help! I misplaced / lost my iPhone 5 today morning in delta Chelsea hotel downtown an I am not able to track it. Please help!, has some good advice regarding your options when your iDevice is lost or stolen.

1. Reporting a lost or stolen Apple product

2. Find my lost iPod Touch

3. AT&T. Sprint, and Verizon can block stolen phones/tablets

4. What-To-Do-When-Iphone-Is-Stolen

5. What to do if your iOS device is lost or stolen

6. 6 Ways to Track and Recover Your Lost/Stolen iPhone

7. Find My iPhone

8. Report Stolen iPad | Stolen Lost Found Online

It pays to be proactive by following the advice on using Find My Phone before you lose your device:

1. Find My iPhone

2. Setup your iDevice on iCloud