As an exercise, I have just designed (using FreeCAD) and 3D-Printed (using semi-translucent PLA material) a casing for M24LR-DISCOVERY (CR95HF NFC Reader). Let me know if you need one :-)

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You can enter Service Menu on Xperia devices with code:

It is very kind of Sony that they created an easy way to unlock Bootloader of Xperia Android Smartphones. You can now customize your phone firmware and OS :-)

I have just bought next inexpensive Xperia M5 phone with pretty nice hardware. However I already found those things to be missing or deliberately removed:

• USB OTG does not work (solved).
• CardBoard VR does not work.

Update regarding USB OTG – “it’s not a bug its a feature” – after you connect a USB device using OTG cable you need to run “Detect USB device” application that will make OTG work. Considering security this may be a good choice to allow external devices by hand.