Yea they all require your to have an account with them. Google being the most intrusive though. I would really stay away from Android. Blackberry is pretty non intrusive. They don't have the app support like Android and Apple though. Their tablet is pretty decent and it pairs with the phone. But they too require an account to use. I would just make a dummy account if your that concerned with your privacy. As far as Other OS's go, you can just install a firewall or use your router to monitor inbound and outbound traffic to determine who is phoning home. Linux is probably the safest solution. Don't know too much bout Macs.