Find my iPhone
How do I sop it?
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If you mean that you want to turn off or cancel Lost Mode, see the following from If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support
How do you turn off or cancel Lost Mode?
You can turn off Lost Mode by entering the passcode on your device. You can also turn off Lost Mode on iCloud.com or from the Find My iPhone app.
If that isn't what you meant, you may want to reply with more details.