I'm not sure how to go about this... Uusing wifi atm but I find it drains the battery quite badly on my iPhone as it's constantly connected even when I'm not using it. My theory is that if I go via bluetooth, it'll only tether within range? Meaning I could leave the iPhone downstairs and it wouldn't be draining the battery. So, how to do this? I've managed to pair it... but then what? Any help appreciated.