Looking on the internet deeply has found these results:

if you have any question is the most popular phrase on the web.

if you have any more questions 1163,000 results on the web	if you have any question 11,890,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Feb 11, 2015 ... If you have any more questions, or we weren't in your time zone If you have any more questions, please contact us. Office of Financial Aid and Scholarships Davis Hall, Room 252 � 701 S. Nedderman Dr. Box 19199 � Arlington�... keep em coming, I'll be checking back all week! #askmp @MarcoPoloMP. Feb 18, 2015 ... If you have any more questions about licensing, you may want to check out the GNU site that explains how our GPL v2 license works. ... con gusto responder� a las dudas o preguntas que tenga la persona a quien dirijo la carta? "If you have any more questions I'll be glad to...."	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

if you have any more questions

1163,000 results on the web

if you have any question

11,890,000 results on the web

More popular!

Feb 11, 2015 ... If you have any more questions, or we weren't in your time zone
If you have any more questions, please contact us. Office of Financial Aid and Scholarships Davis Hall, Room 252 � 701 S. Nedderman Dr. Box 19199 � Arlington�...
keep em coming, I'll be checking back all week! #askmp @MarcoPoloMP.
Feb 18, 2015 ... If you have any more questions about licensing, you may want to check out the GNU site that explains how our GPL v2 license works.
... con gusto responder� a las dudas o preguntas que tenga la persona a quien dirijo la carta? "If you have any more questions I'll be glad to...."

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.