entering Business phone in Bitpipe.com form for downloading whitepaper

every time I enter registration form to download
white paper(wp.bitpipe.com/resource/org_980281345_799/Business_Process_Reengineering_Manufacturing_edp.pdf?site_cd=vnu ) on BPR the field for Business Phone tells me as incorect or invlid entry for stdcode+local land line number
for 10 digit mobile number.

plese any one suggest how to fill the form