There are several text based and binary message types in the SMS technology.
The most common message type is a standard text message, that is less then 160
characters and that uses the 7 bit GSM alphabet. If you want to send a message
longer then 160 characters, you will send a multipart SMS. A message containing
international characters, is called a unicode SMS. A unicode SMS message can
contain 70 characters. If you want to send a unicode message longer
then 70 characters, you will send a multipart unicode SMS message. Text
messages can also have attributes. These attributes can make the message
display immediately when it arrives (FLASH sms), or they can turn on small
icons on the cellphone (e.g.: voice mail indication).
Binary messages can carry mobile phone configuration information and mobile
content. For example a ringtone, a wallpaper or WAP browser settings can be
sent as SMS. For a complete list of SMS message types, please visit the
SMS Message Type page.
Multipart messages are used if long text is sent through the network. In
this case text is split into several SMS messages, during the delivery.
When you send a long message the sending mobile phone splits the message into
segments, and sends it through the mobile network. The
recipient phone reassembles the segments and displays the text to the user
when all message parts arrive. This means a multipart SMS is message takes
several SMS-es to go through the mobile network, meaning it costs more.
Ozeki NG SMS Gateway handles multipart messages properly. It does the
segmentation when necessary for outgoing messages and it performs the
reassembly for incoming multipart SMS-es.