Search contacts by phone number

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lack of user discovery is at the same time a feature on its own, this is out of scope for now, as mentioned in:

Discover mutuals

hashing doesn’t solve the problem, it is not only about server storing phone numbers, but anyone being able to iterate over phone numbers, generate hash and ask the server for the contact, basically any contact discovery is at the same time an anti-feature, there are enough of such messengers out there, it is better if Delta Chat tries to cover the other need: a safe messenger for family and kids where no one can discover your family members and scam them, do fishing or manipulate children, ex…