def phone
      @phone ||= -> {
        mac = Jia::Utils.load_data('phone_mac').sample
        area_code = rand(9999).to_s.center(4, rand(9).to_s)
        user_identifier = rand(9999).to_s.center(4, rand(9).to_s)
        "#{mac}#{area_code}#{user_identifier}"
      }.call
    end
def phone
      @phone ||= -> {
        mac = Jia::Utils.load_data('phone_mac').sample
        area_code = rand(9999).to_s.center(4, rand(9).to_s)
        user_identifier = rand(9999).to_s.center(4, rand(9).to_s)
        "#{mac}#{area_code}#{user_identifier}"
      }.call
    end
Get phone number

   Jia::User.new.phone # => '18100000000'