Why is there a character limit to my SMS?
The maximum SMS body length is actually 160 characters (7-bit) or 70 unicode-encoded characters.
In addition, your SMS body will typically contain a link to the relevant campaign, appointment or payment your text message is about. This link is 20 characters long which, so we take that into account and limit the length to 140 characters.
If you are seeing a maximum message length of only 50 characters rather then 140, this is an indication that you are requesting unicode encoding.