訓 たずさ(える),たずさ(わる) ・ 音 ケイ
漢越音: huề
The hand radical 扌 gives the meaning: to carry something along with you. The right side is phonetic kei. Hence keitai, literally what you carry, now a mobile phone.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
携帯電話を家に忘れました。 (けいたいでんわをいえにわすれました)
I left my mobile phone at home.