This could be for a number of reasons:
- You may have run out of onoff credits
- You may have run out of calling credit or available minutes on your SIM card.
- The number you are calling is incorrect or cannot be reached.
- We might be suffering some slight technical difficulties.
The best thing to do in all cases is to contact customer support on: email@example.com or submit a ticket via the "Submit a request" button at the top of this page.