Concatenated 

SMS

 support

Previous 

SMS

 versions had a built-in feature to split or paginate long messages into multiple pages if the 

SMS

 message body exceeds the size limit (160 ASCII characters, or 70 UTC-16 characters; in Canada ASCII 136). Footers (1/2, 2/2) were added at the bottom of each page. From 2.9.7 release, 

SMS

 supports concatenated messages together with our short message service center (SMSC) (aggregator) OpenMarket. Long messages are still divided into pages. Instead of footers, special protocol level headers (UDH), are added to each page. OpenMarket or carriers concatenate all pages and send to a user's handset as a single long text message. More than one long message sent to the same address at the same time are not mixed up, as each message is identified by a message ID. The Concatenated 

SMS

 feature supports up to 2000 characters.

Most US carriers support the Concatenated SMS support feature, except for the following:

For carriers that do not support concatenated messages, OpenMarket submits each message segment as individual messages. Footers (1/2, 2/2) are added to each message to indicate the segment number for each message.