Something like that? 🐶🐾🤔

function hashPhoneNumber(phoneNumber):
    hashedValue = ""
    
    for each digit in phoneNumber:
        if hashedValue is empty:
            hashedValue = argon2Hash(digit)
        else:
            concatenated = hashedValue + digit
            hashedValue = argon2Hash(concatenated)
    
    return hashedValue