Nobody likes to fill out forms. It's our job to make the experience as pleasant as possible—or at least not frustrating. Have you ever filled in your phone number just to learn, that you provided it in the "wrong format"? This can be quite annoying.
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Don't restrict users to fill in the information in a certain way. Accept different formats and convert the data when processing it.
Written by Jonas Kamber, Digital Product Nerd and UX Enthusiast since 1998. LinkedIn