Sen beni ararmısın cepten numara versem

I am answer no thanks is it wrong answer or an polite answer

Its up to you, If you dont want to call this person at least you are being upfront

 Would you call me on [my] mobile if I give you number ?

As Deli said,its up to you..but if you want to be polite to say no, you can also say like this;

"Kusura bakma, arayamam." [ Sorry, I cant [call you] ]

ok thanks Tunci