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Settings-apps-all,look for contacts and phone app,force stop and clear data. Make sure to have a backup of your contacts.
Hi,
I'm a bit confused, how do you mean that it does not work? What happens when you enter the phonebook, do you receive any error message?
Where is the contacts stored? Do you sync via Gmail or an Exchange account or is it local contacts? After the repair, did you restore any backup were your contacts was stored?