I've recently received my micro:bit and worked through most of the projects in jlucas 's blog - great start.
I'm keen to code on my Android tablet and smartphone and then use bluetooth to flash the .hex file to the micro:bit, but I'm not having any success.
I've downloaded the SAMSUNG app to both my phone and my tablet and after a lot of fiddling around, I can pair both devices to the micro:bit. I'm sure youngsters will get very very frustrated with this process!! I failed so many times to even start the pairing process that I found and downloaded a ble checker to both my phone and tablet - yes they both support ble - but not all phones/tablets do & that could be a problem for some users.
However, before I can flash the .hex file across, I have to connect to the micro:bit. Both the phone and the tablet repeatedly refuse to connect to the micro:bit, so I am stymied.