Here's my concept of what "Other Half" should be / ideas:
- The phone's battery slides out from the top of the device, and secures nicely
- The phone has a small 200mAh non-removable internal battery used when changing batteries/Halves
- The phone's battery could be fused to OtherHalves to shave off thickness (where it makes sense)
- The backside of the phone has two oppositely placed areas for contact between the Half and the phone.
- "The Contact" should be a relatively flat, secure attachment, magnet aided, using USB interface.



Other Halves:
- Extended battery (1,800mAh, 2,500mAh)
- THICK Extended battery (3,500mAh+)

- Thin, light qwerty (azerty, etc etc and variants)
- Thick, heavier qwerty (includes an extended battery)
- Programmable Keyboard / one used for commands and coding

- Gamepad (Quad-Shoulder oads. Nub with three action buttons, mirror imaged for both thumbs)
- Gametroller (Contoured PS-style controller with slot for the phone)
- Touchscreen (No actual screen/images. On the back for some PS Vita / Motorola Backflip style use cases)
- Second Screen (Second Touchscreen useful for eBooks if low power).

- Tactical backplate (NFC, Infrared, etc etc)
- Metal Kickstand (which also acts and amplifies the strength of Cell-Radio Signals)
- Loud(er)speakers
- Camera blackplate (Slot for lens attachment. Friendly Two-Step Shutter button. Gripper)
- Additional storage (For media/files only... not for executable Apps)
- Dual SIM card attachment
- Pico Projector

- Backplates (with glowing lights a la Macbook Apple logo)
- Backplates (Colours. Limited Editions: Clear, Matte, Kevlar, CarbonFibre, Gel, Glow'Dark, EtchaSketch, Metallic, Gold, Swarovski etc etc)
- Wallet attached backplate
- Screen flap protector backplates
- Post it Note dispenser!!!!!!!!!!1!!!!!

- Wearables (Wrist/gauntlet, Arm holders, Headband, Batman utility belt, Bum Bag, Bike Mount)

- Other accessories could be mobile/unattached (ie Bluetooth speakers)
- Or they can be connected via a case (eg Phone protector + Stylus holder)
- Or connected via the Headset jack*** / microUSB ports.

...the list is comprehensive! Can't think of anything else, if I do I'll add it here. I think my ideas are practical, and really bring out the best possibilities for the concept.

Physical Properties (most ideal):
- 5.2 inch screen slab,
- Shaved-bezels,
- A clean buttonless front.
- Both ports on the bottom side
- Only 4 physical buttons all located on the right side
.....something close to the resemblance of THIS old concept.

Symmetrical Design:
- Front stereo loudspeakers (switch L and R roles)
- Top/bottom symmetrical mics (switch between Master and Noise cancelling mic)
- Function physical buttons (Vol+/- Power Camera******) switch roles when orientation changes between 0/180'.
.......Turn the phone upside down and it works as normal !!!!

A User Interface / Experience:


Combining all these ideas (Phone Physical Properties, Symmetry, User Xperience, TheOtherHalf)... just imagine how revolutionary that would be!!

FEEDBACK ANYONE ?!?!
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*****Physical button may not be dedicated for Camera only, the user can select any Task to launch from it.

***Headset jack should be highest quality possible but with 2.5mm jack. Its a widely accepted standard, not as much as 3.5mm but they're compatible. It saves space in a compact device like phones. We should make the switch just like how miniUSB made the switch to microUSB. I dunno, just a rant.