Best mobile you used
Still love my Blackberry Classic 4G, Does everything I need it to.
As far as best mobile...I wear many hats. Not only am I a licensed Forensic Psychologist, but I am also a network engineer that works with electronics all day. I HIGHLY recommend the Samsung Galaxy Series. I am using the Samsung Galaxy Fold 4 and let me say...I absolutely love it. The battery lasts for roughly 10 days. Amazing phone...super fast with the 16 core snap-dragon processor.
Galaxy Note 10+
Great battery life, stylus, water resistant, and expandable memory through an SD card.
Definitely Nokia 6310, it takes up to 14 days before full discharge and responsiveness was almost realtime. The best part is that battery is still working after ~15 years (up to 1 day)