phone number in quick sales order form

Hi dear,

can anyone tell me that how to display customer phone number in phone number field...I've added phone number field in my quick sales order .my customers also have phone numbers but when I input an existing customer phone numbers r not displays in phone number field. it always shows blank.if anyone knows any way to display numbers whatever from personalization or any other way plz help me.I need this help urgently.

Regards

Bushra Saad