Each mobile phone number has a corresponding email address:
China Mobile mobile email account:cell-phone number@139.com,Login URL:https://mail.10086.cn
China Unicom mobile email account:cell-phone number@wo.cn,Login URL:http://mail.wo.cn
China Telecom Mobile Email Account:cell-phone number@189.cn perhaps Fixed line phone number@189.cn,Login URL:https://webmail30.189.cn