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Which UX is better? Select your phone number 212-382-8872 000-000-0000 999-999-9999 Select your phone number COO 988 Like Q Comment Share 803 comments 33 shares 7 Send fosyep ( 2 10 mo. ago I prefer binary search, the worst case is 10 attempts. 4 2 3 Share prescod – 10 mo. ago I love it! "Higher, higher, lower, lower." 3 Share fosyep 2 10 mo. ago You gave me one more idea. Say that the combination to get to your phone number is "Higher, higher, lower, lower", this can be coded in binary to 1100, which is 12 in decimal. So basically you could say "hey my phone number is 12" and everyone could calculate your full phone number 4 4 5 Share