How long can my SMS message be?
The maximum SMS body length for one message is 160 characters (7-bit) or 70 unicode-encoded characters (non-English characters). Please keep in mind that text message notifications typically contain a link, which is about 20 characters long, to either a campaign, appointment or payment.
For this reason, your message is limited to 140 characters.
Going over the character limit causes multiple SMS to send. When this happens, the carrier decides the order in which the messages are delivered to your client's phone and this can lead to confusion, or even break the link included in the message. For this reason, SMS messages are limited to 160 characters to keep your notification down to one text.