Guys, we have come to a conclusion that there is something wrong with the Safaricom data billing system... Just the other day, i bought a 25mb bundle for 20/- ; then I got into Google-maps on iPhone to navigate from Nakumatt Junction to a road after Nakumatt Prestige called Kabarnet Rd.. And guess what, even after the map had loaded, and I was just staring at the blue dot - my 20mb got finished before I arrived at destination - which is quite odd. Conclusion: I suspect that Safaricom charges for data handshake between the phone and the data core system; whereas they are supposed to charge for the actual payload received from the internet :: Which in a math chart, handshakes takes about 75% of data, while actual internet data delivered or sent is 5-15%:: be wary !!! Try Orange data service et al