My iphone 4s wont download or update apps on wifi

My iPhone won't update or download apps it won't recognize apps that need to be updated and won't download new or old apps and it won't ask for my iTunes password when purchasing a new app. also I'm having trouble with downloading music i have signed in and out of my iTunes account to reconnect and try going to the app itself in the app store for the updates but only show the open button.

Thank you for contacting apple support community
my name is jaydin
will you try the following
go to settings>iTunes&app store>sign out and sign back in 

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