Three calculation types:
- without rounding to block (default)
- standard rounding – round data to your carrier's basic unit (block of data)
- separately round outgoing and incoming data to your carrier's basic unit (block of data)
Example:
Basic carrier unit: 100 KB
In standard:
Received 134 KB, sent 455 KB –> after disable mobile network in your phone will be saved: 134+455=589 (round to 600 KB)->600 KB
When enable separately rounding outgoing and incoming data (you have to enable separately rouning in application options):
Received 134 KB, sent 455 KB –> after disable mobile network in your phone will be saved: 134 (round to 200 KB)+455 (round to 500 KB)=700 KB

Screenshots: