I'm finding that Bluetooth does not use up a huge amount of battery on my phone. I just generally keep things turned off unless I need them in order to not run down the battery unnecessarily. You just never know when a derecho will sweep through and knock out the electricity for a week...
For a long time I just didn't see a need to connect my phone to the car's Bluetooth. My commute was 4 miles each way, so I was only in the car for long trips on weekends. I live alone, have no family within 300 miles, have no children who depend on me or significant other to make plans with. No one has an urgent need to reach me. And I really don't get very many phone calls.
I synced the car to the phone recently because my commute has gotten longer, and I've been working from home in the mornings and driving to work around lunchtime. So it's possible that someone at work might want to call me while I'm in transit. Also during long trips I sometimes want to call someone at my destination to let them know where I am and if there are any delays.
I can see how it's a useful tool for many people, but until recently I had no motivation to use it myself.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles