2-way SMS

2-way SMS service – a combination of MT and MO services, allowing the CLIENT to transmit messages and receive replies from the End User.

The service is provided through a virtual number, issued by the provider. Depending on the destination country, virtual numbers can be presented by long codes, short codes or standard phone numbers.


  1. Short code : 114, 4565,.. (usually up to 5-6 digits)
  2. Long code : 0133-xxxx-xxx (Korea) (special virtual number, does not look like a real phone number; issued by designated entity in each country)
  3. Standard phone number : 7-914-xxx-xx-xx, 82-10-xxxx-xxxx (in some countries Mobile carriers provide numbers similar to standard mobile numbers)

2-way service is widely used for various purposes:

  • Advertisement opt-out (unsubscribing)
  • Customer care lines (*with TOLL-free numbers)
  • Polls and surveys
  • Marketing campaigns



SureM 2-way SMS service flow



Mobile Number Portability (MNP) is a service that allows you to switch over to another mobile service provider while retaining your existing mobile phone number.

Mobile number portability is implemented in different ways across the globe. The International and European standard is for a customer wishing to port his/her number to contact the new network (recipient), which then sends the number portability request (NPR) to the current network (donor). This is known as “recipient-led” porting. The UK and India are the only exceptions to implement the donor-led system. The customer wishing to port his/her number is required to contact the donor to obtain a code (Porting Authorisation Code (PAC) in the UK and Unique Porting Code (UPC) in India) which is then given to the recipient network. The recipient continues the porting process by contacting the donor with porting code. This form of porting is known as “donor-led” and has been criticised by some industry analysts as being inefficient, though prevents MNP scams. It has also been observed that it may act as a customer deterrent as well as allowing the donor an opportunity of “winning back” the customer.


South Korea introduced MNP more than 10 years ago, in 2004.

To know if your country has the MNP implemented, the easiest way to check is ask your mobile providers. MNP gives mobile carriers a good opportunity to lurk in more customers, as retaining one’s mobile number while switching to a better option of service is indeed very attractive.

Here are some of the websites you may use to know about different countries’ policies on MNP:



Sender ID

What is Sender ID?g14110

When you receive a message, what is the first thing you are looking at? The number it came from. It will happen unconsciously, as the text message and its meaning might differ depending on who you received ot.

About Sender ID

– Sender ID is the originated address of which the message comes from.- It is often the displayed sender on the mobile number.- Each country has its own sender ID restrictions

Sender ID can be

  • 1. Alpha sender – Ex. SureM
  • 2. Numeric sender – Ex. 8215884640
  • 3. Alphanumeric sender ID – Ex. SureM123

Here are some examples of Sender ID regulations per country :

    • 1. Korea
      • No alpha / alphanumeric sender ID allowed
      • Only numeric sender ID is allowed
      • Between 0 ~ 12 digits
    • 2. India
      • Need to pre-register alpha Sender ID
      • Fixed 6 digits
      • Ex. SUREMC
    • 3. China
      • Numeric only
      • Need to pre-register signature to be added at the bottom of the message

Ex ) Good day! Thank you using SureM Service. 【SureM】

Every country has different regulations regarding the Sender ID policy. To get a detailed consultation contact SureM.

E-mail : sureminternational@gmail.com



MO (Mobile Originated) – message transmission from a handset device to a client (program) or application.

MO service is often used as part of 2-way SMS service (MT/MO combination).

In this case, companies send MT message first and receive a response from the end user.

Example :

MT : To unsubscribe from this newsletter reply STOP.

MO : STOP  (it will automatically be forwarded to the MT sender)


The service provider is assigning a certain Sender ID (long or short code) and the Client might receive MO messages from the end users, sent to the designated Sender ID. The procedure looks similar to the standard MT flow, only the other way around, with message originating on the mobile device.




The most common cases for MO service usage are :

  1. Talent show voting (“To vote for Kelly send KELLY to 1234”)
  2. “Request a song” shows
  3. TV Homeshopping (“Send us the item number to receive a free consultation”)
  4. Subscribing to newsletters


What is Look-up Service?

Is a service wherein the client requests to search for information on a requested number in the central database that contains information of each mobile phone subscriber that is authorized to use the mobile core network. Look-up service is determined by IMSI (International Mobile Subscriber Identity). IMSI is a 15 digit (or shorter) unique number that is stored in the mobile SIM card. The IMSI holds the information of the mobile phone numbers.

Look-up Service Provides

  • Telecom Operator
  • Country
  • Mobile number availability
  • Mobile number portability
  • Mobile number roaming status

Look-up Service Advantages

  • Filter out virtual numbers, landline numbers, or any numbers that cannot receive SMS before SMS transmission.
  • Check the availability of the phone, portability, or the roaming status of the phone.

Service Flow

  • 1. Client sends out number look-up request to SureM
  • 2. SureM receives the number request and forwards it to the service provider
  • 3. Service provider then receives the number request from SureM
  • 4. Service provider searches the number on the central database and receives the look-up result from central database
  • 5. Service provider sends the look-up result to SureM
  • 6. SureM simplifies the result to the client’s convenience and forwards it to the client
For more information on SureM Look-up service follow the link and get in touch with Support Team!
E-mail : sureminternational@gmail.com


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What is API?

API (Application Programming Interface) is a specification that explains on how systems interact or integrate with each other.SureM provides API suitable for development environment of each client. The interface can be customized by needs of client. We provide best service to client with various ways of integration including HTTP/S and SMPP.

Key Features

  • API Specification Provision
  • No set-up fee/monthly fee
  • Delivery Report Provided


Under HTTP/S, you can integrate your application to SureM using http protocol.

HTTP – Hyper Text Transfer ProtocolHTTPS – Hyper Text Transfer Protocol Secure Socket Layer


SMPP is industry standard for sending SMS to network providers.
Telecommunication industry use SMPP protocol for SMS between Short Message Service Center (SMSC) and/or External Short Messaging Entities (ESME).

SMPP – Short Message Peer-to-Peer

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  • Solution
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The Short Message Peer-to-Peer (SMPP) is an open, industry standard protocol widely used in the telecommunication industry.

SMPP is desinged to provide a flexible data communication interface for the transfer of SMS messages between Short Message Service Centeres (SMSC), Routing Entities (RE), and SMS Application Systems (or External Short Messaging Entities (ESME)).

SMPP is an application protocol over TCP/IP, which allows fast and reliable delivery of SMS messages. The latest version of SMPP specification currently is 5.0 ( can be found at http://opensmpp.org/specs/smppv50.pdf ). At SureM, we support SMPP 3.4 and 5.0 so whichever protocol the customer prefers – we can easily modify the system or even customize it upon request.

Supported PDUs

  • bind_transmitter
  • bind_receiver
  • bind_tranceiver
  • unbind
  • submit_sm
  • data_sm
  • deliver_sm
  • enquire_link

Data Coding Schemes

  • 0 or 1 : ASCII
  • 3 : Latin 1
  • 8 : UCS2
  • 14: KSC5601

(For more about SMPP, please refer https://en.wikipedia.org/wiki/Short_Message_Peer-to-Peer)