Why are my messages with unicode being split?
When using the SMS resource URI to send text messages, messages with non-GSM characters are limited to 70 characters. Any SMS messages that include 1 or more non-GSM characters will be separated by Twilio into messages of 70 characters or less. You can find out what characters are included in the GSM set here.
If you are sending unicode messages to mobile numbers in US and Canada, try the Messages Resource URI instead. You can send messages containing up to 1600 characters without being split.