I wrote some example code for writing nokiajam-compatible games with Octo, my CHIP-8 IDE:
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For anyone who is going to participate by using the Godot Engine, you can use my starter project: https://github.com/TheWhiteLlama/nokia3310-jam-godot-starter
So, while this might be bending the jam rules, the Nokia 3310 could also make DTMF dial tones (not as a part of the internal synth, but from making calls). If you'd like these you can find some for free here:
Let me know if this breaks the rules too much =)
I found some good public domain 3x5 and 4x5 fonts here: