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DevilsBreathProtect

Harmony 4 / Xpression Plus 3 / Premier Pro Plus

LG · catalog updated 2026-10-21

All supported devices
Brand
LG
Kind
Android phone · released 2020-06
Model codes
LM-K400, LGL455DL

Ships with Android 10; later updates are not known. Cricket's Harmony 4 was announced in June 2020; the Xpression Plus 3 is the AT&T version and the Premier Pro Plus (LGL455DL) the TracFone version. No built-in gesture or key opens a chosen app.

Gestures on the Harmony 4 / Xpression Plus 3 / Premier Pro Plus

No gesture specific to this model is known. We only list what the manufacturer or reliable sources document.

Plus what the app offers on every Android phone: In-app button, Widget, Quick Settings tile, Shake, Volume keys, Voice phrase. How to set those up

Recommended presets

  • Shake ×3Sends a signal

    Three sharp shakes within 2.5 s: hard to do by accident, easy to do without looking.

    Shake ×3, 0.15–1 s apart · whole gesture within 2.5 s

  • Widget ×2Sends a signal

    Two taps on the home-screen widget within 3 s; a single accidental tap does nothing.

    Widget ×2, 0.1–3 s apart · whole gesture within 3 s

Gestures are set up in the phone settings as shown, then combined into a trigger recipe in the app, where practice mode shows step by step whether a gesture would trigger.