what is his telephone number ?
It is XXXXX
His telephone number is XXXXX.
what is her telephone number ?
It is XXXXX.
Her telephone number is XXXXX.
What is his/her phone number?
His/her phone number is ....
或者.....is his/her phone number
Q: What is her phone number?
A: Her phone number is ....... （或者直接说出号码）
如果还要具体点，可把phone替换为mobile phone (移动电话) desk phone (座机电话）fax (传真）等等。
希望我的回答能令你满意。
What's her telephone number?
Her telephone number is...
It's...
What is his phone number?
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