my version which used above advice - thanks and an extra step I needed.
Go to Settings -> Safari -> and Clear Cookies and Data and also Clear History - scroll down to see those settings.
Set Block Cookies to either "from third parties and advertisers" or "Never" (you choose which one)
In Advanced (scroll down, it's the last setting) make sure JavaScript in ON
Here is the last step I had to make to fix it - which may not apply to you. Some time ago I changed my primary email for apple. I noticed it was asking me to enter the password for the secondary email.
I went into iTunes and App Store, tapped my Apple Id and then Sign Out. I then resigned in using my primary Apple email and password.
Just to make sure, I turned the phone off and on, but honestly this may be optional.