Apple 12 SMS website can't be opened.

Check whether the network is normal. Many people have this situation because there is no internet connection.

See if Safari access is not allowed in the access restrictions. In Settings-General-Access Restrictions, allow Safari access. Don't open too many background programs in daily use. Double-click the phone's Home button and slide up to close the programs running in the background. The time switch can clear the cache of the mobile phone.