- RISCV processor
- Standard Logic board
- Standard Screen
- Standard Battery
- Standard Wifi & Bluetooth modem
- Probably ditch cellular and use something like LoRa
- Standard OS (Linux)
- Standard package manager
Edit: Imagine a phone that you can just swap and mix components from different manufacturers. You could buy the components yourself and assemble, like a standard PC. If one manufacturer tries to lock you in, or you don't like their component you simply replace it.
1) The form factor really fights this.
2) Something needs to change with ARM, cause modular hardware would require device independent ISOs, and that only seams to exist for x86.... IDK about RISCV