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)