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The User Experience of Mobile Phone Numbers is a look at the user experience of an archaic technology that we got used to live with. We don’t even consider it archaic and we’re numb to all the little nuances it has: The mobile phone numbers. There are several Domain Name Servers (DNS) in the world that serve like an address book. Their numbers never change, so your browser can always call them to ask about “the phone number” of facebook.com or google.com.