How many characters can an SMS consist of?
The HTTP API is limited to a max of 4 concatenated messages. The maximum length for:
- Standard SMS: 4 * 153 = 612 characters
- Unicode SMS: 4 * 67 = 268 characters
other restrictions may apply
it is possible that some countries/operators/routes do not support the limits described above. So it is possible that some destinations or routes allow shorter messages (or even no concatenation at all)