Mabey you were sleeping and she was watching some pron,check browser history:)
This was my first idea as well. Since the early days of internet computing - if there is a huge unknown traffic going on, look for porn, or some sort of porn gadgets
But if seriously, yes, smartphones are very dangerous because of silent downloads. Every freaking thing on them wants to go online, without even thinking about asking for permission. This can get super bad if you travel abroad and Opera or something decides that it's a good idea to download multi-megabyte update via roaming networks, charging over 50$ per MB.
I heard androids are data hogs.
I battled this problem with not agreeing to any any "do you agree to transfer blablabla, which can happen while no apps are running", not agreeing to any updates, data transfer or synchronization, and not joining the app market. Also, I turn off the network most of the time. That of course means that the device turns into a good ol' brick phone on steroids, and cuts down most of the fancy features. But since I only use it for tethering and internet browser while I'm not at home, it works out ok.
Software installation is also a huge problem, APK's are pretty much unavailable outside App Market.
I have to praise Mozilla, Adobe and some opensource projects for supplying APKs on their websites, but most of the companies only offer downloads through App Market. Which means you either have to agree to infest your phone with legitimate malware/spyware/trojans, or you can't use most of the phones features.
Download something like https://market.android.com/details?id=j ... ndroidterm
And run a "top -n 1", you'll see that a lot of apps register as services, even if they are not reported as running through GUI.
And the worst part is that I can't root my phone to get access to something like "sudo kill -9 pidofaprocess", without specialized hardware (Wildfire S)
Core 2 Duo E6300, MSI P45 NEO-F, Club 3D GTX 260, 4Gb DDR2-800Mhz, Audigy X-Fi Fatal1ty Champ1on ed., 0.5Tb+1Tb Seagate Barracuda 7200.12, 630W AXP, Samsung SyncMaster BX2450, ViewSonic VP171b