Notification > SMS > Service Policy > International Sending Policy

Guide to Sending International SMS Messages

  • When sending international SMS messages, please check the following key points.

Country-specific Sender ID Policy

  • International SMS messages are sent according to country-specific sender ID policies and may be treated as spam if you do not follow the policies.
  • The sending number set by the customer is not guaranteed to be exposed on the receiving device. In most cases, the messages are sent after changing the sending number to a random number in order to send international SMS messages normally.

Sending Policy

  • For detailed country-specific policies, see the Detailed guide to SMS sending by country.
  • In countries with strict international SMS message policies such as China and Vietnam, messages can be sent normally only if the content of the sending message is a verification number (OTP).
  • To send messages properly, it is recommended to enter the verification number (OTP) as follows. (Example: Your verification code is 00000)
  • If you wish to send marketing messages, please contact the Customer Center in advance.
  • To send international SMS messages normally, phrases of up to 12 characters may be added to messages according to country-specific policies, and the phrases are included in the number of charged characters.
  • International SMS is sent to international carriers and returns a DLR.
  • Each DLR provides a message status and result code, which allows you to know the delivery status of a particular SMS, but accuracy cannot be absolutely guaranteed, and the message status and result code can be NULL depending on the carrier and handset circumstances.
  • International carriers generally only keep sending logs within 7 days, so depending on the time of inquiry, it is difficult to confirm the exact cause of non-receipt and may take some time.
  • Transmission quality by country is affected by the network and infrastructure environment in that country and may differ from the domestic environment.

Billing Policy

  • International SMS messages are charged based on successful data transmission from overseas carriers.
  • International SMS billing policies are independent of DLR message status and DLR result codes.
  • The device reception result means the success of data transmission to the overseas communication service provider, and may differ from the actual device reception result. Even if the actual user did not receive the message, it may still count towards billing.
  • International SMS can send long messages through the Concatenated message feature. In the case of a long message, you will be charged for the number of messages sent based on character count.
  • With Concatenated message applied, the number of characters that can be sent is reduced while processing headers.
  • The number of characters and concatenated message standards follow the international SMS standards.
  • Even if the message is sent with the concatenated message applied, it may be received by the device in the form of several short messages rather than a long message, depending on the mobile carrier and device policy.
  • The number of charges per message can be checked with the messageCount field of the detailed inquiry from the console and the detailed inquiry api.
encoding 1 charge 2 charges 3 charges 4 charges 5 charges
UCS-2
(Unicode)		 70 characters 134 characters
(=67*2)		 201 characters
(=67*3)		 268 characters
(=67*4)		 335 characters
(=67*5)
GSM-7bit 160 characters 306 characters
(=153*2)		 459 characters
(=153*3)		 612 characters
(=153*4)		 765 characters
(=153*5)

International SMS Traffic pumping

  • Some international mobile network operators (MNOs) may artificially trigger the sending of messages to increase revenues.
  • A bot or abuser makes a bulk request to send a message on a page, such as a request for a signup verification number.
  • Most bots or abusers don't actually authenticate after requesting authentication. When abusing occurs, requests for authentication number increases, but the percentage that authenticate and convert decreases.
  • Precautions
    • In the event of international SMS volume pumping, we may block some or all international SMS volumes without prior notice to the project.
    • NHN Cloud is not responsible for any damage caused by abusing or blocking, so please be careful about leaking confidential information and abusing.
  • Recommended actions
    • Restrict sending to countries you don't intend to send messages to via the manage countries to allow.
    • Limit the number of sendings you can send per month to an appropriate level.
    • The Set blocking countries by conversion rate setting allows you to block sending to countries with low conversion rates.
    • Limit the maximum number of authentication requests allowed for the same IP band or similar incoming numbers, or the rate at which they are sent per second, as appropriate.
    • Prevent messages that are being sent to similar number ranges (e.g., +1111111110, +1111111111, +1111111112, +1111111113, etc.) from being ingested consecutively.

Sending Blocking based on international SMS conversion rate

  • In general, you consider a conversion to have occurred when a recipient takes an action after receiving your message, such as clicking a URL or entering a verification number.
  • The Block by international SMS conversion rate feature allows you to check whether recipients convert after receiving a message, increasing the reliability of your international SMS sending and strengthening your protection against abusive behavior.

Collection of international SMS conversions

  • Set whether or not to collect conversion rates in the request to collect conversion rates field when making the international SMS sending API request.
  • When you determine that a shipment that you set up to collect conversion rates has converted, you can notify NHN Cloud of the conversion through a conversion API call.
    • You should only call the conversion API for messages that have been sent, otherwise the call to the conversion API will fail.
    • For more information, see API v3.0 Guide.
  • Calculates the percentage of sent messaged that are converted from the messages set for collection of conversion rates, you can block messages from being sent to certain countries.
    • If you have more than 50 messages sent to a country with Conversion Rate Based Sending Blocking and Notifications enabled in a 24-hour period, and your conversion rate is 50% or less, sending to that country is automatically blocked.

Set blocking countries by conversion rate

  • In Delivery Settings > International SMS from the console, you must change the Block by conversion rate setting to Enable.
  • After enabling the feature, you must set which countries to block based on conversion rate.
    • Conversion rate is calculated and blocking applies for each country based on the conversion rate-based blocking rule settings.
  • Countries that are blocked based on conversion rate-based blocking rule settings are visible in the console and can be unblocked by selecting Block.
    • If you unblock a conversion rate between the time range of the blocking rule you set, the conversion rate is calculated from the time you unblocked it to avoid reblocking.
  • For more information, see the console user guide.

Available countries

Country name Country code
United States / Canada 1
Russia / Kazakhstan 7
Egypt 20
South Africa 27
Greece 30
Netherlands 31
Belgium 32
France 33
Spain 34
Hungary 36
Italy 39
Romania 40
Switzerland 41
Austria 43
United Kingdom 44
Denmark 45
Sweden 46
Norway 47
Poland 48
Germany 49
Peru 51
Mexico 52
Cuba 53
Argentina 54
Brazil 55
Chile 56
Colombia 57
Venezuela 58
Malaysia 60
Australia 61
Indonesia 62
Philippines 63
New Zealand 64
Singapore 65
Thailand 66
Japan 81
Vietnam 84
China 86
Turkey 90
India 91
Pakistan 92
Afghanistan 93
Sri Lanka 94
Myanmar 95
Iran 98
South Sudan 211
Morocco 212
Algeria 213
Tunisia 216
Libya 218
Gambia 220
Senegal 221
Mauritania 222
Mali 223
Guinea 224
Côte d'Ivoire 225
Burkina Faso 226
Niger 227
Togo 228
Benin 229
Mauritius 230
Liberia 231
Sierra Leone 232
Ghana 233
Nigeria 234
Chad 235
Central African Republic 236
Cameroon 237
Cape Verde 238
S. Tomé & Principe 239
Equatorial Guinea 240
Gabon 241
Congo 242
Democratic Republic of the Congo 243
Angola 244
Guinea-Bissau 245
Seychelles 248
Sudan 249
Rwanda 250
Ethiopia 251
Somalia 252
Djibouti 253
Kenya 254
Tanzania 255
Uganda 256
Burundi 257
Mozambique 258
Zambia 260
Madagascar 261
Réunion Island 262
Zimbabwe 263
Namibia 264
Malawi 265
Lesotho 266
Botswana 267
Swaziland 268
Mayotte / Comoros 269
Saint Helena 290
Eritrea 291
Aruba 297
Faroe Islands 298
Greenland 299
Gibraltar 350
Portugal 351
Luxembourg 352
Ireland 353
Iceland 354
Albania 355
Malta 356
Cyprus 357
Finland 358
Bulgaria 359
Lithuania 370
Latvia 371
Estonia 372
Moldova 373
Armenia 374
Belarus 375
Andorra 376
Monaco 377
San Marino 378
Ukraine 380
Serbia 381
Montenegro 382
Republic of Kosovo 383
Croatia 385
Slovenia 386
Bosnia and Herzegovina 387
North Macedonia 389
Czechia 420
Slovakia 421
Liechtenstein 423
Falkland Islands 500
Belize 501
Guatemala 502
El Salvador 503
Honduras 504
Nicaragua 505
Costa Rica 506
Panama 507
St. Pierre & Miquelon 508
Haiti 509
Guadeloupe 590
Bolivia 591
Guyana 592
Ecuador 593
French Guiana 594
Paraguay 595
Martinique 596
Suriname 597
Uruguay 598
Nederlandse Antillen / Curaçao 599
Timor-Leste 670
Brunei Darussalam 673
Nauru 674
Papua New Guinea 675
Tonga 676
Solomon Islands 677
Vanuatu 678
Fiji 679
Palau 680
Wallis and Futuna 681
Cocos Keeling Islands (Cook Islands) 682
Samoa 685
Kiribati 686
New Caledonia 687
French Polynesia 689
Micronesia 691
Marshall Islands 692
Hong-Kong 852
Macau 853
Cambodia 855
Laos 856
Bangladesh 880
Taiwan 886
Maldives 960
Lebanon 961
Jordan 962
Syria 963
Iraq 964
Kuwait 965
Saudi Arabia 966
Yemen 967
Oman 968
Palestine 970
United Arab Emirates 971
Israel 972
Bahrain 973
Qatar 974
Bhutan 975
Mongolia 976
Nepal 977
Tajikistan 992
Turkmenistan 993
Azerbaijan 994
Georgia 995
Kyrgyzstan 996
Uzbekistan 998
Bahamas 1242
Barbados 1246
Anguilla 1264
Antigua & Barbuda 1268
Virgin Islands (US) 1284
British Virgin Islands 1340
Cayman Islands 1345
Bermuda 1441
Grenada 1473
Turks & Caicos Is. 1649
Montserrat 1664
Northern Marianas 1670
Guam 1671
American Samoa 1684
St. Lucia 1758
Dominica 1767
St. Vincent and the Grenadines 1784
Puerto Rico 1787, 1939
Dominican Republic 1809, 1829, 1849
Trinidad & Tobago Rep. 1868
St. Kitts and Nevis 1869
Jamaica 1876
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