When 160 characters isn't enough, you can send long messages through the OZSMS web portal by using concatenation. Concatenation allows you to split long messages into multiple shorter parts that will send as multiple messages before being reassembled for the recipient.

Each segment can contain up to 160 characters, which means you can send a message of up to 459 characters (3 segments x 160 characters per segment) using concatenation. However, it's important to note that the actual number of segments that a long message is split into depends on various factors, such as the encoding used and the type of characters in the message.