Digital address books are broken
Just like old paper versions, in 2017 everyone still manages their own contact list. When friends change their numbers, you have to update them on your phone. When you change your phone number you have to manually tell everyone. If you are travelling and have a temporary SIM card you may be uncontactable. If you're like us, you have lots of numbers in your address book and can't remember exactly who they belong to. You have no idea who has your contact information.
We are currently a stealth mode startup working on solving these problems.