Spanish telephone validator

spain_phones.rb

AREA_CODES   =  {
      Marbella: [822], Badajoz:[ 824, 924], Guipuzcoa: [843,943],
      Navarra: [848, 948], Granada: [858, 958], Murcia: [868, 968], Baleares:[871, 971],
      Gerona: [872, 972], Lerida:[ 873, 973],Zaragoza: [876, 976],
      Tarragona:[877, 977], Pontevedra: [886, 986], Madrid: [911, 912, 913, 914, 915, 916, 917, 918],
      Segovia: [921], Salamanca: [923], Toledo: [925], Ciudad_Real: [926], Caceres: [927],
      Barcelona: [931, 932, 933, 934, 935, 936, 937, 938], La_Rioja: [941], Cantabria: [942],
      Vizcaya: [944, 946], Alava: [945], Burgos: [947], Guadalajara: [949], Almeria: [950],
      Malaga: [951, 952], Jaen: [953], Sevilla: [954, 955], Cordoba: [957], Huelva: [959],
      Valencia: [960, 961, 962, 963], Alicante: [965, 966],  Albacete: [967], Cuenca: [969],
      Huesca: [974],  Soria: [975], Teruel: [978], Palencia: [979], Zamora: [980], Lugo: [982],
      Valladolid: [983], Asturias: [984, 985], Orense: [988]
    }.freeze

class SpainPhone

  attr_accessor :phone_number

  def initialize phone_number
    @phone_number = phone_number.to_s
  end

  def valid?
    return false if @phone_number.length != 9
    return !@phone_number.match(/^[9678][0-9]{8}$/).nil?
  end

  def area_code
    return @phone_number[0..2] if valid?
  end
      
  def country_code
    "+34"
  end
      
  def international
    [country_code, @phone_number].join
  end      

  def phone_type
    return nil unless valid?
    if area_code.match(/^80[1-9]|^90[1-9]/)
      "premium"
    elsif area_code.match(/^800|^900/)
      "toll-free"
    else
      @phone_number.match(/^[67]\d{8}$/).nil? ? "landline" : "mobile"
    end
  end

  def province
    return nil unless phone_type == "landline"
    AREA_CODES.each do |key, value|
      value.each do |area|
        return key if area.to_s == area_code
      end
    end
  end
end