Darbird API’s support sending SMS in all text-based languages (e.g., English, French, Chinese, Arabic, etc.).
Messages containing only GSM03.38 7-bit characters have a maximum limit of 1600 characters. Messages longer than 160 characters are split into multiple message units, each unit consisting of 153 characters.
Messages containing one or more UCS-2 16-bit Unicode characters have a maximum limit of 737 characters. Messages longer than 70 characters are split into multiple message units, each unit consisting of 67 characters.
List of Unicode characters can be checked from here: https://unicode-table.com/en/#control-character
Multi-unit messages are automatically stitched back together and delivered as a single message in countries where mobile networks support long message concatenation.