I believe it lacks practicality. I mean, it might be feasible to save storage space on phones by running Bitcoin Core in pruned mode, but to validate blocks, it would need to remain constantly active. It's a suboptimal solution, to say the least. Run a REAL full node!
Maybe they will do it with https://zerosync.org/ But yes, you are right, it lacks of practicality, use case. On a mobile device you should have only LN wallets not core nodes.
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Just like your server, you only need to spin it up once on a while when you want to use it
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Also how much memory your phone must have? Is it compatible with SD cards? I don't think it can match the sync speed and space needed than a pc node.
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