When 160 characters aren't enough, you can send long messages through OZSMS web portals by using concatenation. Concatenation is a technique that allows you to split a long message into multiple parts, or segments, and send them as separate SMS messages that are reassembled on 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.