I'm using Nokia 106. Calls. Texts. Nothing else. I turn it off at 6pm and on at 9am.
Doesn't have data, GPS, Bluetooth or WiFi so that's not a problem. The best it gives is rough triangulation data from cell towers but I can leave it at home and do nefarious things to my own heart's content if I so desire (not that I intend to).
OK, thanks. My wife has just bought a cheap Nokia 103 (she's used Nokias for ages) and I was surprised that it had Bluetooth. It showed up on the laptop I was using at the time, but I couldn't find any way to connect to it. (They didn't pair.)
I checked and it did have Bluetooth on the Nokia 103 menu.
That said, all that data harvested and used to customize the interface for you is indeed convenient.