Since I switched my iPhone from giffgaff to O2 , I kept falling foul of O2’s 1Gb per month data cap on my iPhone tariff. So I’m trying data-shrinking app Onavo, and so far it’s making a real difference. No discernible slowing down, but the app shows its saving me on average a third on my data usage, and in some cases as much as 80%.

I’ve got a slight nagging feeling about funnelling all my data through an unknown startup, but the utility they provide (plus some smart answers to that question online from their founder) mean I can easily get over that.