Blockchain phones would be a great idea of they were decentralized. A big company coming out with blockchain technology is probably going to fail. They are mostly just seeing it as an opportunity to offload some of their data center costs onto the mining/staking community. Any centrally controlled coin is really missing the point of the blockchain.

Imagine a future where there are actually decentralized phones. Phones not controlled by an oligopoly or a local monopoly, but truly decentralized worldwide phone service. It may be possible. Actually, it may be inevitable.