携 means “carry, take along”

けい · kei

Also: portable, carry (in hand), armed with, bring along

Kun'yomi (Japanese reading)
たずさえる, たずさわる
On'yomi (Chinese reading)
ケイ

JLPT N1 · Taught in secondary school · 13 strokes

The story

A hand (扌) with a little bird (隹) perched on it, taken wherever you go: 携 is carrying along. 携帯 is portable, and simply a cell phone in daily talk, 提携 is a business tie-up, and 携わる is to have a hand in some work.

Used in 携帯 (keitai, cell phone/portable), 提携 (teikei, partnership), and 携わる (tazusawaru, to be involved in)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.