Zero conf channels.. Essentially disposable channels. Actual sats are on your node, so the mobile can spend/receive without having to worry about the phone. If the phone is lost/compromised, you just kill the channel from your node. I know @DarthCoin has Blixt guides, but not sure if it goes into private/trusted zero conf channels.
Yes I wrote a guide about that scenario here and indeed I didn't talk too much about 0-conf channels, just briefly mention them. https://darthcoin.substack.com/p/dunder-lsp-and-lightning-box-provider and here https://darthcoin.substack.com/p/bitcoin-private-banks-over-lightning
But I don't know what OP want to do, so not sure if these scenarios are good for him.
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