help - com.android.phone has stopped.

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http://androidforums.com – I have a gemei g2 tablet. I deleted some kind of phone application from a system folder and now this piece of garbage doesn't work anymore. A blocking pop-up keeps saying "the process com.android.phone has stopped". Each time I dismiss it, it pops up again, making the whole thing unusable. How do I fix it? Thanks in advance! (General)