if the wifi signal is weak you can move around the router to see if that improves signal but those results looks like you have is internet connection limitations to me, that is your isp giving you that service, a service you don't like
about phone signal, that has nothing to do with the wifi, that only means that your walls are thick, concrette possibly and that the antenna is far from you or has weak signal in that area
it has to do if the isp uses the same cellphone antenna for the smartphone and for the internet connection as is the case in some rural areas or in some residential areas without optical fibre, adls or coaxial cable coverage
about the speeds, you have a 8 mbps download speed, if your contract says that you should have 9, well, call them to see what is happening, if the area has weak coverage or what is going on
they surely ask ypu to repeat test using ethernet and repeat some tsts
one thing i see there is interesting, you have 1 megabit per second of download, shouldn't be 5?
on most connections is 5 to one or 3 to one, a fifth form the download speed or a a third of the download speed
if you have 9 megabits per second of download, a fifth shold be 1.7 to 2 megabits, if a third should be 3 megabits per second
your connection seems to go oe to ten, 10 megabits download, 1 upload
still sounds like a isp thing, call them to confirm details of your contract