How to say iphone case in japanese?

How to say iphone case in japanese?

アイフォーンケース

Iphone ケース
アイフォン・ケース
aifon kēsu
"Kēsu" is the loanword for "case."

Edited:
"iphone" is FORMALLY written as "アイフォーン," unlike "スマートフォン" for "smartphone."
As an expression in daily use, "アイフォン" is more common, I think.

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