There are no absolutely secure smartphones. Any gadget transfers a lot of data to the mobile network, for example. If u use public WiFi, you can automatically forget about security. Still, on Android you can install special programs for security. Or you can develop some by your own.
I do agree with you there is no secure smart phone as it stands as they devices can be compromised by people who understand them well
And possibly android should be the OS to use for a more controllable privacy option