Why isn't my iphone keyboard working?

The letters U, B, and N arent working but everything else is working fine.

Try pressin power and home button together until the iPhone closes and you see an apple logo, MIGHT help

Turn it off and turn it on again. My phone does that sometimes… If that doesn't work reboot by pressing home and power button

How do you fix your iphone 4s keybored if it dose not work

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