|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.
At the climax of the Legend War, the Go-Phones were made redundant when the Go-Ongers sacrificed their powers with the rest of the first 34 Super Sentai to destroy the invasion force of the Space Empire Zangyack. Resurfacing as Ranger Keys, the Go-Onger powers would be used by the Gokaigers to assume their forms via the Gokai Change. Ultimately, the Gokaigers returned their borrowed powers to their rightful owners after overthrowing Zangyack.
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)