Technology

SMS FAQ

What is GPRS?
What is SMS?
What is EDGE?
What is 3GSM?
Can I transmit data/fax transmission work over GSM?
Can I transmit data over GSM using an analogue modem?
Do I have to pay to get messages on my mobile phone?
How do I compose text messages from my cellular phone?
How do I send and receive text messages from my cellular phone to/from another Cellphone?
What if the recipient's cellular phone is off or out of the service area?
What are the two types of SMS?
What is Point-to-Point?
What are the two types of Point-to-Point messages?
What is MT (short message - mobile terminated)?
What is MO (mobile originated)?
What is the maximum length of a Point-to-Point short message?
What is the maximum length of a Point-to-Omnipoint short message?
How do mobiles know to display only those messages desired by the MS user?

What is GPRS?

General Packet Radio Service (GPRS) enabled networks offer 'always-on,' higher capacity, Internet-based content and packet-based data services. This enables services such as colour Internet browsing, e-mail on the move, powerful visual communications, multimedia messages, and location-based services.
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What is SMS?

SMS (Short Message Service) is a service for sending messages of up to 160 characters (224 characters if using a 5-bit mode) to mobile phones that use Global System for Mobile (GSM) communication.
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What is EDGE?

Enhanced Data rates for GSM Evolution (EDGE) is a 3G technology that refers to further enhancements in data capability over GSM networks, which delivers broadband-like data speeds to mobile devices. This will achieve the delivery of advanced mobile services such as the downloading of video and music clips, full multimedia messaging, high-speed colour Internet access, and e-mail.
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What is 3GSM?

3GSM refers to third generation mobile services, which primarily focus around multimedia services. This is built around a core GSM network with a Wideband-CDMA (W-CDMA) air interface. Almost all of the world's network operators offer 3GSM services.
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Can I transmit data/fax transmission work over GSM?

Yes. The data/fax transmission services were made available with the GSM Phase 2 features (see GSM in Glossary).
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Can I transmit data over GSM using an analogue modem?

No. GSM networks use a speech optimization COmpressor or DECompressor (CODEC) to pick up voice tone frequencies and discard non-voice tones. Thus, frequencies or tones generated by analogue modems are discarded.
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Do I have to pay to get messages on my mobile phone?

Receiving SMS messages on your mobile telephone may or may not be free. You should check with your network/mobile carrier (e.g. Rogers, Vodafone, Mobistar, Orange, etc.) to see if there are charges to receive text messages on your mobile phone.
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How do I compose text messages from my cellular phone?

Enter letters and numbers by pressing the appropriate keys on your phone. It's easy - each key (except the "*" key, which is a backspace function) has more than one value. For example, pressing the "2" key once gives you the letter A. Twice gives you the letter B. Four times is the number 2. Five times and you're back to A. When you hear the letter or number you want to use, just hit the pound key to advance to the next letter.

To enter a space to separate words, press pound twice (once to advance to the next letter, once again to indicate the end of a word.)

To backspace, press the star key (*). You can find punctuation on the 1 key. Keep pressing 1 and you'll hear a selection of punctuation marks.
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How do I send and receive text messages from my cellular phone to/from another Cellphone?

You can send and receive text messages from your cellular phone to/from another cellular phone in two ways. Your message can be up to 160 characters long and can be keyed in from your handset. Longer text messages by sending multiple messages. The same message can also be sent to multiple recipients.

To read the message:

When you receive a message, the cell phone rings and often a blinking message alerts you that you have received a text message which can be read by clicking a key.
or
1. Go to 'Message' menu.
2. Go to 'Read Message.'
3. Read the message.
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What if the recipient's cellular phone is off or out of the service area?

If the recipient's phone is out of the service area or turned off, the message is stored on the network. The recipient will receive their messages when their handset is re-activated, or on returning to the service area. To send a message to another cellular user:
1. Reach your cellular phone's 'Message' menu.
2. Go to 'Write Message' menu.
3. Type the message to be sent. While in write text mode, the keys automatically punch alphabets written below the numbers. Press a key once, twice or three times to write the desired alphabet.
4. To send the message to the cellular phone user, enter the mobile number or locate it from your phone's phonebook.

Some network operators will respond with a confirmation message when the message is sent. If the recipient's phone is out of the service area or turned off, the message is stored on the network. The recipient will receive their messages when their handset is re-activated, or on returning to the service area.
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What are the two types of SMS?

Point-to-Point and Point-to-Omnipoint (cell broadcast)
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What is Point-to-Point?

Point-to-Point uses a dedicated link between the network and the mobile station allowing bi-directional messaging without operator interaction.
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What are the two types of Point-to-Point messages?

Mobile originated (MO)
1. Message originates from a mobile handset and Mobile terminated (MT)
2. Message is terminated on a mobile handset

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What is MT (short message - mobile terminated)?

SMS-MT, or SMS Push, refers to a message packet whose final destination is a mobile handset. Thus, the delivery is terminated at the mobile device. Examples:

  • Sending a text message to your cellular phone from a website
  • Direct marketing: promotions, new product announcements
  • Information services: news headlines, weather forecasts
  • Notifications and real-time alerts: stock alerts, sports scores, travel
  • Games: trivia, quizzes
  • Ring tones, pictures, movies

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What is MO (mobile originated)?

SMS-MO, or SMS Pull, refers to a message packet that originated from a mobile handset. Thus, the delivery begins at the mobile device. The final destination could be another wireless handset or a networked computer, set up to respond or perform a particular action depending on the content of the message. This gives mobile users the ability to request or "pull" information by sending a message from their mobile device to a content provider. Examples:

  • Voting
  • Quiz or sweepstakes answers

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What is the maximum length of a Point-to-Point short message?

Two-way data transport = 140 Octet Data Payload Supports Either:
140 bytes for binary data transport (PDU format)
160 characters for text messaging transport (7-bit ASCII)

Point-to-Omnipoint, or Cell Broadcast, sends messages to predetermined cell broadcast areas. Unlike Point-to-Point messaging, Cell Broadcast does not use a dedicated link. The network operator is where all messages originate and the recipients include all users within a given cell, area, or network. Also unlike Point-to-Point, CB messages do not provide any assurance that the message was recieved.
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What is the maximum length of a Point-to-Omnipoint short message?

A Point-to-Omnipoint short message is a maximum of 93 charaters (82 octets) in length.
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How do mobiles know to display only those messages desired by the MS user?

CB messages are assigned message classes that categorize the type of information contained in the message.
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