"Issue resolved. It was never a programmatic issue. The above DesiredCapabilites and service_args with "driver = webdriver.PhantomJS( desired_capabilities=dcap, service_args=service_args)" works. The problem was with the proxy provider setup. Once the default UA was removed from the proxy server it allowed the DesiredCapabilites to assign the UA." #work #automation #phantomJS #proxies #user_testing #solutions #web_development #webdriver #pub