Firstly it would need to be modular & upgradable to likely last for decades.
Secondly, I believe phones will be like tablets in 10 years. Much more sparingly used. It’s a mature product that has reached stagnation. Attention will eventually go elsewhere.
But if we truly were to focus on the everlasting aspects:
Screens need to be super tough
Replaceable & recyclable batteries required
Water & stupidity proof
It would also help if it were fashionable for us to have:
wearable cameras so that phones dont need to be the performance cam anymore - given issues over thickness
desire for disconnectivity - so can reduce battery size and have them bend in your pocket or wrap around your wrist.
Firstly it would need to be modular & upgradable to likely last for decades.
Secondly, I believe phones will be like tablets in 10 years. Much more sparingly used. It’s a mature product that has reached stagnation. Attention will eventually go elsewhere.
But if we truly were to focus on the everlasting aspects:
It would also help if it were fashionable for us to have: