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

simserial: record the serial number associated with the device's SIM card, if any. This is an automatic, hidden field type: it is filled in automatically and never shows up in the survey's user interface.

Platform limitations
Only SurveyCTO Collect on Android supports this field type. It's not supported on iOS or the web. More about platform limitations...

In the spreadsheet form definition:

typename
simserialfieldname

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