TNS will take the message length into account when estimating the campaign price, but the final message length may increase if it includes macros that are replaced with content that pushes the message length over the limit.
Why does my message cost more than expected?
One factor that can affect the campaign price is the message length. If your message exceeds the maximum length of SMS text messages, the system will split it into smaller chunks and then merge them back together on the recipient's phone. In this case, the campaign price will be higher since multiple chunks are being sent, and each chunk counts as a separate message for billing purposes.