Cellphones are a type of transformation device in the Kamen Rider series, starting with Kamen Rider 555. While used to transform characters in the show into Rider forms, it is more often used as a power-up item for accessing higher level Rider forms (with the exception of the Rider Gears from 555).
This is, however, a rare form of transformation device in the Kamen Rider universe. It is more reserved for its sister series Super Sentai, as Rangers are a more common user of this type of device.
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