Can you adjust accelerometer sensitivity on mobile devices?

I've been working with the accelerometer on the Nexus 5, and it looks like it peaks at +/- 2g. It looks like the accelerometer is capable of sensing more than that, but an afternoon of research has only produced frustration, information overload, and hints at the darkest magicks.

Apparently a lot of devices can sense up to +/- 8g, some up to +/- 16g. But as far as I can tell, that data is completely inaccessible. I think it's because bumping the detection up past +/- 2g is, generally, kind of silly and takes a lot of power, so the sensors are locked to the lowest sensitivity level. Except the iPhone 6, which actually has two accelerometers, one that's low-power and one that's high-power, and will switch between them as needed...maybe? I think? It's all pretty damn confusing.

Anyway: is there any way to sense more than +/- 2g on any device? Or anyway to control the sensitivity level from within Unity?