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credit to original poster
You need a VPN set to Turkey, but once you've got that going, go to the S Sports Plus Signup page here ..
S Sport Plus
If your browser gives you the option to translate from turkish to english, then definitely take it !.
Enter your details on the next page ..
"Ad" = First Name
"Soyad" = Surname
"E-Posta" = Email address. I tried my regular gmail address and it said it couldn't be used but then I tried a spare hotmail address and it worked fine.
"Şifre" is Password
"Şifre (TekRar)" is Confirm Password
The next three checkboxes are the usual T's & C's stuff, although the first one is also about consenting to receive marketing emails. I initially left this off and got an error, but when I ticked it, i was able to click the button at the bottom to take me to the payment screen.
Now this is where it went a bit weird for me, but it still worked.
I clicked on the "Annual" payment option and nothing happened. It just refused to go to the next screen so I ended up coming out of the browser completely and trying again.
I went to the S Sports Plus main page and chose the "Member Login" option that's to the left of the big red "Sign Up" button in the top right. It'll say "Üye Girisi" if it's not translated.
I entered my email and password and it signed me in without a problem. So then I went to my profile, the head and shoulders symbol in the top right, and selected the option "Üyelik Bilgileri" which took me to the subscription options page.
I selected the annual subscription option on the right for 179.99 and it worked - it took me to the payment card details on the next screen. I used a Mastercard just to be on the safe side, as I had a funny feeling it might possibly reject a UK-based debit card, and hey presto, I was signed up for a whole year !.
Now as far as the practicalities of actually watching the football goes, I haven't had a chance to try it yet but I think it would be safe to say that you'll have to have your VPN on and set to Turkey to watch the content.
They do have an app, but I imagine it'll be easier for android users to sideload than iOS, but then I've got my PC connectec to my TV via HDMI so i can still watch it on the big screen.