When I was looking at data SIMs in Portugal (where you don't need to register SIMs, which is handy), I read that some networks rounded data sessions up to the nearest MB, but it wasn't clear what constituted a data session, so if you've got apps polling for updates every hour, each one could waste almost a MB each time, eating up 700MB of allowance each month on top of your actual usage.
Wouldn't be surprised if UK networks were similarly fucktardy.
When I was looking at data SIMs in Portugal (where you don't need to register SIMs, which is handy), I read that some networks rounded data sessions up to the nearest MB, but it wasn't clear what constituted a data session, so if you've got apps polling for updates every hour, each one could waste almost a MB each time, eating up 700MB of allowance each month on top of your actual usage.
Wouldn't be surprised if UK networks were similarly fucktardy.