If you had Find My iPhone enabled on your iPhone, go to https://www.icloud.com, sign in with your Apple ID and password, and open the Find My iPhone app. If your iPhone is turned on and connected to the Internet, it will be located in this app. If it is located, you have the option to set a passcode on the device or to remotely erase the device.
Additionally, if your iPhone can’t be located with Find My iPhone, go to https://appleid.apple.com and change your Apple ID password. If you don’t have a passcode on your IPhone, this won’t stop someone from viewing what’s on the device. However, it will stop them from using anything with your Apple ID account. Once you reset your password, you will need to enter the new password on your other Apple devices to access services such as iTunes & App Store, Messages, and FaceTime.
If you haven’t disabled Find My iPhone, the service is probably still active. If your iPhone required a passcode to unlock the device, hopefully you picked a code that isn’t easily guessed. It this case, the thief may not have been able to access your iPhone data at all.
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