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In the form designer, edit Form settings, then check the deviceid meta-data field (if it isn't already).

deviceid: record the unique ID of the device used to fill out the survey. This field type can be used to link different surveys filled out on the same device. For example, you might have a "login form" that surveyors fill out each morning when they begin using a device, and then you might use the deviceid to link that data with the data from later forms filled out on the same device. This is an automatic, hidden field type: it is filled in automatically and never shows up in the survey's user interface.

Platform limitations
When users fill in forms using a web browser, the recorded deviceid will always be "(web)". More about platform limitations...

In the spreadsheet form definition:

typename
deviceidfieldname

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