|This article is about a/an changer in Engine Sentai Go-Onger.|
- "Let's Go-On!"
- ―Transformation call[src]
The Transformation Cellular Go-Phone (変身携帯ゴーフォン Henshin Keitai Gōfon) is a device that only Sosuke (Go-On Red), Saki (Go-On Yellow) and Renn (Go-On Blue) can use during the series. It has various functions such as transforming them to the Go-ongers by inserting the blue Change Soul in the phone and by saying the transformation phrase "Change Soul, set! Let's Go-On!" (チェンジソール、セット！レッツゴーオン！ Chenji Sōru, setto! Rettsu Gō-On!) and combining their respective Engines into Engine-O, as well as Engine-O G6 and Engine-O G12.
Summoning Engine Gattai Button Sequence
- Engine-O - 1+2+3 (The Engine numbers)
- Engine-O G6 - 5+6 (5 Go-ongers & 6 Engines)
- Engine-O G9 - 7+9 (7 Go-ongers & 9 Engines)
- Engine-O G12 - 7+12 (7 Go-ongers & 12 Engines)