Cannot access iCloud from iOS device to set up mail filtering.
It i cannot access iCloud.com from an iPhone how do I set up spam filtering? Flagging mail as junk in the iPhone mail client does nothing.
I don't use iCloud email so I'm not sure that access to iCloud.com is necessary, but if it is you can access it from an iOS device. Just go to https://www.icloud.com/ and when you get to the screen that gives the options to "Set up iCloud on this device", "Open Find My iPhone" etc just touch and hold the semi-circular refresh arrow at the right end go the address bar. That will bring up the "Request Desktop Site" option.