It has taken over two months for only 25 photos of an iPhone photo library of circa 200 to backup to the Cloud using Wi-Fi only. The iPhone has the latest IOS and the Cloud App is also the current version. The phone is almost constantly connected to a BT Smart Hub however there is still no backup progress when connected to other Wi-Fi.
BT, your resolution please?
I have the same issue on my iPhone 7; started about 1 week ago and does not matter whether I'm using wifi or data