My phone will not let me type anything

when i try to enter contact and i press a letter key nothing the same with numbers i was messing with it to try and get it to let me text numbers so i was pushing differant buttons combo of buttons so im not sure what i did ive never had a zte phone before and im sure i will never have one again but in the mean time i would like to be able to use this one any ideas what ive done to it and can it be fixed

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