If you have any questions about the rules of the jam that are not answered below feel free to ask them in this thread and I will get back to you as soon as I can!

When can I start working on my game?

Your game, including all assets outside of the resource page, should be made within the jam’s duration.

Does my game have to run on a real Nokia 3310?

Nope! We're just using the restrictions as a design space.

Can I make my own engine?

Yes! Many participants have done this. Feel free to make the framework before the jam begins. Just make sure it doesn’t put you ahead of other people using pre-made engines.

How do I make my game as accurate as possible to the Nokia 3310?

None of the following is necessary to submit a game and it won’t improve your score. This is for those who want to go the extra mile. Game fps should be 15. Ensure you are not using more "modern technology" like physics engines, 3d graphics, etc. The simpler the better. You could simulate the LCD's ghosting. The Nokia 3310’s screen also did not use perfectly square pixels. Each pixel was likely a 3:4 / 7:9 ratio.

  The Nokia 3310 was incapable of sub-pixel movement and sub-pixel scrolling so it is NOT allowed. This means all pixels must be perfectly aligned with the pixel grid. There should be no half-pixels even while moving. The ultimate challenge would be to get your game running on a real Nokia 3310!

Only 12 controls are allowed but the Nokia 3310 has 16 buttons.

The jam excludes the 4 menu buttons as they were usually used to navigate menu's and not play the actual game.

Can I mix and match the three color palettes? 

No. You should be selecting one option and making your whole game with your selection. Palette swapping is allowed if it is an option/setting and not part of gameplay.

Is it mandatory to use the sounds linked in Nokia Jam Resources? Can we edit them, e.g. speed up, slow down, cut or loop? Can we make our own 1-bit bleeps? (I would like to have more noise-like sounds)

Four questions if I may.
These are in relation to simulating real-world usage of the phone itself. Menus and all.
1) Can the 4 menu buttons be used in the case that that they are used for emulated Nokia menu navigation and not for gameplay systems?

2) May the "whitespace" that the 3310 had bordering the LCD screen be included in the game, assuming that it is not utilized as part of the display area?

3) Are sounds emulating the dull click of pressing the phones buttons allowed?

4) Is accuracy to the phone's operating system necessary in cases where the Nokia's menus and such are represented?

To give context to these question, I'm brainstorming a concept that tells a story using the phone and it's functions (such as text messaging) as a narrative tool. 
Below is a mock-up made to visualize the idea I have. 

*Edit: For anyone concerned that the above is an early start on making a game. The whole animation above was done as a concept in Aseprite. Sixty-three frames of tedious wrist pain. Timeline shown below