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Just now I was texting my fiancé off my iPhone 4 when all of a sudden the sound the keys make when you touch them went out. I went to check the volume but It wouldn't change. The ringer thing showed up but no bars did. All sound works except when I lock it, unlock it, texts, calls, and the keyboard clicks when I blow in the charging port it starts working again. Somebody Explain what's wrong please? What should I do
Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Try each of these in order until the issue is resolved.

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