Go to -> Settings -> Account and back up -> Manage accounts and click on the ones you want to remove. Keep in mind you can't delete the one you first set up your phone with in the begging.
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Do you back up your stuff just incase something like this ever happens? If your phone has a slot for an SD card you should get one or there are other option like Google and so on.
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Choose the contact you want, on the bottom there will be some choices, choose Edit and there will be 'view more' select and scroll down there will be a rington option.
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You can try a soft reset, if it doesn't work you can try factory reset. Make sure to back up all your data and important stuff before the factory reset. Or, if you have I surance you can go through it... This new updates that have been issue has come with bugs. I did a soft reset on mine and didn't work so I did a Factory Reset and it seems better.
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