GainBroadband services now provided by DakotaPro.biz GainBroadband Webmail Login To access your billing account, please visit our Customer Information Pages Dial-up, customer service and technical support are now accessible via DakotaPro.biz’s website and telephone numbers. We can also be contacted at (520) 745-3900 or toll free at (866) 666-0425 if you have any questions. The support team at DakotaPro.biz