Bitdefender is saying that free apps on iOS and Android are much more invasive than users would expect. They readily track your location, your contact list and your Device ID to serve ads to you.
A week of Windows 10, holograms and Exploding Kittens on Mars
Office 2016 launching this year, touch apps coming soon
Microsoft reveals the next version of Windows 10
Introducing Windows 10 for phones
Hands on with HoloLens
Download: Windows 10 build 9926