{"package_name":"com.sec.android.app.factorykeystring","label":"DeviceKeystring","device_count":48,"observation_count":72,"user_facing_count":0,"first_seen":"2025-05-05T17:48:10Z","last_seen":"2026-09-18T01:54:07Z","guidance":{"summary":"A Samsung-signed system package labelled \"DeviceKeystring\", with no launcher entry: this site records it as not user-facing on every observation. Its name and label place it in the same keystring family as DRParser Mode and Service mode, documented above, a keystring being one of the star-and-hash sequences typed into the dialler to reach a hidden diagnostic screen.\n\nAs with the others, Samsung publishes no documentation for it, so this note describes the mechanism and the package's provenance rather than claiming to know which individual test screens it holds. Descriptions of specific dial codes for it circulate on APK catalogues and forums, and those are not a basis for a functional claim here.\n\nVersion note: nothing sourced indicates the package has been superseded or replaced. It is observed on this site from API 28 through API 37, and Samsung's application lists record its version as 9 on Android 9-era Galaxy S10+ firmware and 11 on Android 11-era Galaxy S20 FE firmware, matching the Android major version in both cases, which is suggestive rather than conclusive from two entries. The Android 10 change to the platform's dialler debug-code broadcast is described in the DRParser Mode entry above; no source establishes that this package uses that broadcast, so it is offered as context for the family rather than as a claim about this package.\n\nFor Android Enterprise, EMM and kiosk use, handle it exactly as the two entries above: control access through the app allowlist and verify by trying to break out of the kiosk, rather than starting from package removal. Samsung does not document what depends on it, so disabling is rated caution.","safe_to_disable":"caution","sources":[{"title":"Galaxy S10+ LTE (G975F) application list - Samsung Knox CC Mode documentation","url":"https://docs.samsungknox.com/CCMode/G975F_P.pdf"},{"title":"Galaxy S20 FE 5G (G781B) application list - Samsung Knox CC Mode documentation","url":"https://docs.samsungknox.com/CCMode/G781B_R.pdf"},{"title":"TelephonyManager.ACTION_SECRET_CODE - Android API reference","url":"https://developer.android.com/reference/android/telephony/TelephonyManager"},{"title":"How do I prevent users from escaping kiosk (lock task) mode? - Jason Bayton","url":"https://bayton.org/android/android-enterprise-faq/kiosk-escape-prevention/"},{"title":"Package provenance for com.sec.android.app.factorykeystring - Android System App Database","url":"https://sysapps.bayton.org/api/packages/com.sec.android.app.factorykeystring"}],"last_verified":"2026-08-01T00:00:00Z"},"labels":[{"label":"DeviceKeystring","locale":"en-gb","count":26},{"label":"DeviceKeystring","locale":"en","count":20},{"label":"DeviceKeystring","locale":"en-us","count":19},{"label":"DeviceKeystring","locale":"nl-nl","count":5},{"label":"DeviceKeystring","locale":"it-IT","count":5},{"label":"DeviceKeystring","locale":"es-us","count":3},{"label":"DeviceKeystring","locale":"de-de","count":3},{"label":"DeviceKeystring","locale":"en-nl","count":3},{"label":"DeviceKeystring","locale":"es-es","count":2},{"label":"DeviceKeystring","locale":"","count":2},{"label":"DeviceKeystring","locale":"fr-fr","count":2},{"label":"DeviceKeystring","locale":"es-ES","count":2},{"label":"DeviceKeystring","locale":"en-GB","count":2},{"label":"DeviceKeystring","locale":"it-it","count":2},{"label":"DeviceKeystring","locale":"ru-ru","count":1},{"label":"DeviceKeystring","locale":"cs-CZ","count":1},{"label":"DeviceKeystring","locale":"cs-cz","count":1},{"label":"DeviceKeystring","locale":"en-US","count":1},{"label":"DeviceKeystring","locale":"en-au","count":1},{"label":"DeviceKeystring","locale":"es-US","count":1},{"label":"DeviceKeystring","locale":"fr-FR","count":1},{"label":"DeviceKeystring","locale":"fr-dz","count":1},{"label":"DeviceKeystring","locale":"pl-PL","count":1},{"label":"DeviceKeystring","locale":"pl-pl","count":1}],"seen_on":[{"device_id":4974,"make":"samsung","model":"SM-A057G","os_api":"35","observation_count":1,"user_facing_count":0,"last_seen":"2026-08-08T09:19:44Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"34df0e7a9f1cf1892e45c056b4973cd81ccf148a4050d11aea4ac5a65f900a42"}},{"device_id":293,"make":"samsung","model":"SM-A125F","os_api":"31","observation_count":1,"user_facing_count":0,"last_seen":"2026-01-21T16:36:23Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"0a012131b1bdf9e80ef97d37f3b48362be363a464c8445ecf83627ebe8493a1e"}},{"device_id":45,"make":"samsung","model":"SM-A135F","os_api":"34","observation_count":3,"user_facing_count":0,"last_seen":"2026-01-21T21:26:08Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"34df0e7a9f1cf1892e45c056b4973cd81ccf148a4050d11aea4ac5a65f900a42"}},{"device_id":292,"make":"samsung","model":"SM-A137F","os_api":"34","observation_count":1,"user_facing_count":0,"last_seen":"2026-01-17T15:40:39Z"},{"device_id":101,"make":"samsung","model":"SM-A236B","os_api":"34","observation_count":2,"user_facing_count":0,"last_seen":"2026-04-10T09:18:27Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"34df0e7a9f1cf1892e45c056b4973cd81ccf148a4050d11aea4ac5a65f900a42"}},{"device_id":130,"make":"samsung","model":"SM-A266B","os_api":"35","observation_count":2,"user_facing_count":0,"last_seen":"2025-08-21T17:33:39Z"},{"device_id":297,"make":"samsung","model":"SM-A266B","os_api":"36","observation_count":1,"user_facing_count":0,"last_seen":"2026-01-26T12:37:53Z"},{"device_id":3914,"make":"samsung","model":"SM-A346B","os_api":"35","observation_count":1,"user_facing_count":0,"last_seen":"2026-07-27T19:03:49Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"34df0e7a9f1cf1892e45c056b4973cd81ccf148a4050d11aea4ac5a65f900a42"}},{"device_id":75,"make":"samsung","model":"SM-A515F","os_api":"33","observation_count":1,"user_facing_count":0,"last_seen":"2025-06-30T11:33:16Z"},{"device_id":58,"make":"samsung","model":"SM-A528B","os_api":"33","observation_count":1,"user_facing_count":0,"last_seen":"2025-06-19T10:15:41Z"},{"device_id":57,"make":"samsung","model":"SM-A536B","os_api":"35","observation_count":1,"user_facing_count":0,"last_seen":"2025-06-19T09:46:41Z"},{"device_id":4345,"make":"samsung","model":"SM-A536B","os_api":"36","observation_count":1,"user_facing_count":0,"last_seen":"2026-07-29T10:09:51Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"34df0e7a9f1cf1892e45c056b4973cd81ccf148a4050d11aea4ac5a65f900a42"}},{"device_id":76,"make":"samsung","model":"SM-A556B","os_api":"35","observation_count":1,"user_facing_count":0,"last_seen":"2025-07-01T07:26:00Z"},{"device_id":197,"make":"samsung","model":"SM-A566B","os_api":"36","observation_count":3,"user_facing_count":0,"last_seen":"2026-09-12T23:27:15Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"34df0e7a9f1cf1892e45c056b4973cd81ccf148a4050d11aea4ac5a65f900a42"}},{"device_id":94,"make":"samsung","model":"SM-F721B","os_api":"35","observation_count":1,"user_facing_count":0,"last_seen":"2025-07-09T14:36:33Z"},{"device_id":220,"make":"samsung","model":"SM-F766B","os_api":"36","observation_count":1,"user_facing_count":0,"last_seen":"2025-11-11T17:28:28Z"},{"device_id":7287,"make":"samsung","model":"SM-F971B","os_api":"37","observation_count":1,"user_facing_count":0,"last_seen":"2026-09-18T01:54:07Z","provenance":{"classification":"oem","vendor":"Samsung","sha256":"34df0e7a9f1cf1892e45c056b4973cd81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