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I have the z2 Xperia and whenever I try to use the telephone application it appears a message saying top contacts provider application has stopped. What can I do. I can't use my phone. Help
Hi @Baluganesh
Welcome to the community!
Sorry to hear about this 
Can you go to Settings > Apps > All > Phone > Clear Data > Force Stop
Once you have done the above can you restart the device and see if you can use the phone app again?
Let me know 