There was some questions about developing RePhone application on Linux.
I have prepared the complete guide how to prepare Rephone, Linux distro and Eclipse for app development.
It was tested on Ubuntu 15.10 & 16.04 (64bit), but can be easily adapted for other releases/distributions.
You can use my GitHub repository which contains SDK, tools and configured Eclipse projects for https-demo, Lua and JS.
The projects builds in Eclipse without any problem and runs on Rephone.
Rephone mass storage is available in Ubuntu when rephone is booted in mass storage mode.
Serial interface to application is available on /dev/ttyACM0
Serial interface to MK2502 modem (AT Commands) is available on /dev/ttyACM1
You can download the installation guide for detailed instructions.