portable, carry (in hand), armed with, bring along
携 centers on having something with you and ready to use: carrying it by hand, bringing it along, or being equipped with it. The idea of portability follows naturally from something light enough to carry.
携 combines 扌 (hand) with 隽, which is a simplified form of 雋. 雋 likely contributes the sound and carries a meaning of something excellent or select, but the exact historical development of the modern simplified shape is uncertain.
The hand radical 扌 holds onto 隽, like a person carrying a prized object. Imagine a traveler with a hand always on their portable bag, ready to bring it along.
For ケイ, picture carrying a heavy case: case -> ケイ, and your hand 扌 is armed with it wherever you go.
carrying (on one's person or in the hand)
cooperation; coordination; collaboration; alignment
cooperation; tie-up; joint business; partnership; alliance; sponsorship
to engage in; to participate in; to take part in; to be involved in
(Japanese) feature phone (as opposed to a smartphone); mobile phone designed for the Japanese market (with specialized features only available in Japan)
carrying (on one's person); taking with one
to carry in one's hand; to carry with one; to have on one's person; to bear
indispensable; essential; must-have
(Japanese) feature phone (as opposed to a smartphone); mobile phone designed for the Japanese market (with specialized features only available in Japan)
cellphone for kids
system integration
prepaid cellphone
not carrying (driver's license, passport, etc.); not having on one's person; nonpossession
comprehensive tie-up
community cooperation; regional cooperation; local cooperation
foreign cooperation; international cooperation
smartphone; smart phone
to be accompanied by one's family
must-have; indispensable item; necessities
strategic partnership