I-phone unlock screen has very large letters and numbers.

I-phone has large letters and numbers on the unlock screen. can see only about 1/4 of the screen it's so large. can't see the slide to unlock bar, only part of the actual time. will not compress with fingers. phone recieves e-mail/phone calls but can't unlock it. tried restore twice and shutting phone off. pulled SIM card too. when it's restoring the screen is normal size as soon as it's finished it goes back to super -size.