This is the 3013th most frequent Japanese word.
フォン
"フォン" (fon) means "phone" in English.
Here, 'フォン' is used as part of the compound word 'スマートフォン', which refers to 'smartphone'.
このスマートフォンはとても便利です。
This smartphone is very convenient.
In this sentence, 'フォン' is used to mean 'phone', forming part of the compound 'フォンケース', which translates to 'phone case'.
カフェで彼は新しいフォンケースを買いました。
At the cafe, he bought a new phone case.
Here, 'フォン' represents 'phone' as part of the phrase 'フォン越し', meaning 'through the phone'.