Maybe the application don't have valid certificate. And your phone surely can't receive it. Try to download other application
There are many solutions to that,but lemme give you the simple ones but clear,;
1.try to restore the setting of the the phone by going to menu-settings-restore setting,try to restore settings only becase if you resore all the data on phone you will have problem recovering them.
2.go to menu-settings-security-authority/user certificates and try to see if there is certificate of what you are trying to download,if not try to add,
3.try to update your firmware using nokia pc suite which will help you re-install the certificates,get in in [email protected]
SOURCE: i want to turn off checking certificate validity
Go to settings then click on security..
Disable confirmations.
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