Wishlist/Expansion Back

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Hardware wishes warning! This article or section documents a Hardware Wish List item, the features described here may or may not be implemented in future devices.
Gta01b v3 case back open white.jpg

This is the current back, showing where the battery plugs in (central) where the SIM plugs in (middle, lower) and the microSD socket, which is under the SIM socket.

The USB socket is approximately a centimetre to the right of the edge of the void the battery fits in.

The standard back fits snugly to the phone, meaning there is no spare space.

An altered back, that is 5mm or so deeper offers many possibilities, without modifying the core phone at all, and offering users more choices.

Ideas that do not require any modification of the phone.

  • Larger battery, perhaps doubling the existing capacity.
  • Flex cable' from the microSD slot, to a full-size SD socket on the right-middle of the edge of the back of the phone (top right on the image).
  • flex cable' from the SIM slot, to a double SIM socket on the left-middle of the phone (bottom right on image).
  • Stylus' holder
  • AA or AAA battery power options.

If the phone offers a mic-in jack, we can add some cool gadgets:
-A cycle-computer's sensors could be jacked into the mic plug
-The signals of a cycle-computer with wireless sensor could be absorbed by a flat antenna on the phone's back
-A magnetic card stripe-reader has already been shown to work over a laptop's mic-in plug. software available

Ideas which require slight modifications of the phone.

  • Solar charging: world's first solar-powered mobile. Using a rugged solar cell (maybe a solar foil) and a power regulating circuit the Neo could be powered CO2-neutral. After all, there's plenty of space on the back ;-)
  • USB-flex cable: alter the plastics moulding so that the back of the USB socket is accessible, and somehow make a flex cable connectable there.
    • Add a USB blanking plug, to blank off the USB port when the expansion back is in use. This brings USB up into the back of the phone.
    • Alternative: Let the blanking plug be an actual usb connector and attached to the expansion back. No modification needed and I think it is possible to do in an not to ugly way with a custom connector (bonus, you can't loose the blanking plug).

This adds many possibilities. Add a small 3.6-5V converter, and if it's possible to switch on the voltage status of the D0/D1 lines, to turn these off, and add a USB 1.1 hub chip, this makes for a very, very hackable back.


  • Extra storage cards via a ripped off USB multi card reader
  • USB-PIO chip - one of many, to give drive for as many LEDs as you want scattered over the back.
  • USB wlan key, with the cover ripped off, and the connector removed and soldered straight onto the hub outputs.
  • Docking: large contacts on the back, to enable a simple dock, that it just drops into and charges, with static protected USB slave mode port that.
  • IRDA', to enable IR keyboards to work, as well as IR enabling remote functionality

With a slightly thicker back, and much more complex mechanics, a slide-out keyboard - for use in landscape mode - would be possible. A larger fold-out keyboard similar to the device in the previous link could also be possible. The keyboard could be stored in the back of the case and unfolded/swiveled/rotated, placing the phone in the preferred orientation. The keyboard does not have to be powered separately since its physically attached and could be a very "low tech" device but add functionality while attached. Possibly include an integrated mini trackball or other selection device to allow control of on screen selection without using a stylus.

A camera would also be an interesting option.

The advantage of the first class of devices is that they requires no engineering on the behalf of FIC, everything is external, and yet the case can be easily swapped by users.

The second type, with USB requires another socket on the board, and some plastics changes, or a much more involved install suitable only for a very few users.

There are many possible special or general purpose backs possible.

Some basic ideas:

  • powered USB hub: 4 AA battery slots, 4 USB sockets
  • camera: 4 AA battery slots, camera, external SD slot
  • business: 4 AA battery slots, slide out keyboard, wifi
  • writer: 4 AA battery slots, fold-out keyboard, 1 USB and 1 VGA socket
Personal tools
Hardware wishes warning! This article or section documents a Hardware Wish List item, the features described here may or may not be implemented in future devices.
Gta01b v3 case back open white.jpg

This is the current back, showing where the battery plugs in (central) where the SIM plugs in (middle, lower) and the microSD socket, which is under the SIM socket.

The USB socket is approximately a centimetre to the right of the edge of the void the battery fits in.

The standard back fits snugly to the phone, meaning there is no spare space.

An altered back, that is 5mm or so deeper offers many possibilities, without modifying the core phone at all, and offering users more choices.

Ideas that do not require any modification of the phone.

  • Larger battery, perhaps doubling the existing capacity.
  • Flex cable' from the microSD slot, to a full-size SD socket on the right-middle of the edge of the back of the phone (top right on the image).
  • flex cable' from the SIM slot, to a double SIM socket on the left-middle of the phone (bottom right on image).
  • Stylus' holder
  • AA or AAA battery power options.

If the phone offers a mic-in jack, we can add some cool gadgets:
-A cycle-computer's sensors could be jacked into the mic plug
-The signals of a cycle-computer with wireless sensor could be absorbed by a flat antenna on the phone's back
-A magnetic card stripe-reader has already been shown to work over a laptop's mic-in plug. software available

Ideas which require slight modifications of the phone.

  • Solar charging: world's first solar-powered mobile. Using a rugged solar cell (maybe a solar foil) and a power regulating circuit the Neo could be powered CO2-neutral. After all, there's plenty of space on the back ;-)
  • USB-flex cable: alter the plastics moulding so that the back of the USB socket is accessible, and somehow make a flex cable connectable there.
    • Add a USB blanking plug, to blank off the USB port when the expansion back is in use. This brings USB up into the back of the phone.
    • Alternative: Let the blanking plug be an actual usb connector and attached to the expansion back. No modification needed and I think it is possible to do in an not to ugly way with a custom connector (bonus, you can't loose the blanking plug).

This adds many possibilities. Add a small 3.6-5V converter, and if it's possible to switch on the voltage status of the D0/D1 lines, to turn these off, and add a USB 1.1 hub chip, this makes for a very, very hackable back.


  • Extra storage cards via a ripped off USB multi card reader
  • USB-PIO chip - one of many, to give drive for as many LEDs as you want scattered over the back.
  • USB wlan key, with the cover ripped off, and the connector removed and soldered straight onto the hub outputs.
  • Docking: large contacts on the back, to enable a simple dock, that it just drops into and charges, with static protected USB slave mode port that.
  • IRDA', to enable IR keyboards to work, as well as IR enabling remote functionality

With a slightly thicker back, and much more complex mechanics, a slide-out keyboard - for use in landscape mode - would be possible. A larger fold-out keyboard similar to the device in the previous link could also be possible. The keyboard could be stored in the back of the case and unfolded/swiveled/rotated, placing the phone in the preferred orientation. The keyboard does not have to be powered separately since its physically attached and could be a very "low tech" device but add functionality while attached. Possibly include an integrated mini trackball or other selection device to allow control of on screen selection without using a stylus.

A camera would also be an interesting option.

The advantage of the first class of devices is that they requires no engineering on the behalf of FIC, everything is external, and yet the case can be easily swapped by users.

The second type, with USB requires another socket on the board, and some plastics changes, or a much more involved install suitable only for a very few users.

There are many possible special or general purpose backs possible.

Some basic ideas:

  • powered USB hub: 4 AA battery slots, 4 USB sockets
  • camera: 4 AA battery slots, camera, external SD slot
  • business: 4 AA battery slots, slide out keyboard, wifi
  • writer: 4 AA battery slots, fold-out keyboard, 1 USB and 1 VGA socket