Introduction
A personalised SMS ensures that the message is relevant to the recipient.
The length of the message will vary the number of SMS messages sent.
Calculating the length of an SMS
The calculation of characters used always takes the case of personalisation with the most characters. Whether for a customisation or a dynamic customisation the longest case will be taken into account and added to the number of characters used. (More details about personalisation in the article Understanding personalisation in the SMS channel)
If the SMS includes personalisation, at the time of programming it is possible to limit the maximum length that an SMS can reach once the personalisation has been added.
Banner limiting SMS size
When using a short URL, if the full url contains personalisation parameters then the personalisation values are encoded automatically to meet the redirect link standard.
Conclusion
Getting to grips with the length of your SMS and its personalisation means you can keep control of your costs by ensuring you send a relevant message.