UPDATE APPLE ID SETTING SOME ACCOUNT SERVICES REQUIRE YOU TO SIGN IN AGAIN
iPhone 6s, iOS 11.4.1
Do you have access to another network where you can try? That has worked for several people.
Try a forced restart.
When you say you tried a "force restart", do you mean that you held the Home and Power buttons down at the same time until the Apple appeared? Did the Apple appear, and did the phone restart?
What Eric means by another network is have you tried connecting to a different Wifi.
Best,
GB
WiFi
What type of network u talking about?
I hv tried force restart but not working still
Yes I have tried at may wifi connection. But still not working..
Yes I have tried all of this what u said. But still not working at all...
UPDATE APPLE ID SETTING SOME ACCOUNT SERVICES REQUIRE YOU TO SIGN IN AGAIN