If I write "cellphone" he tells me I'm missing a space. If I write "cell phone" he tells me I have an extra space. You're just messin with me today aren't you Duo???
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It's not an adjective, it's actually the genitive of the word póca (pocket, and yes, the genitive singular is the same as the nominative singular). Technically, the Irish fón póca means pocket phone
Increasingly people in the UK say just "mobile". Would that be marked wrong here?