Both are okay. I think A is more likely. But you're more likely to ask if they have a mobile phone than a mobile phone number, aren't you?
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Grammar GeekBut you're more likely to ask if they have a mobile phone than a mobile phone number, aren't you?I agree, but I was thinking of asking for someone's mobile phone number who I'd like to know better.
RegardsIn this context "have" indicates possession and doesn't function as an auxiliary verb.Just for clarification, are you referring to my original example B here?