Can I use my phone for white noise instead?

Yes, with apps like White Noise or MyNoise. However, phone speakers are thin, phone notifications interrupt, and battery drain is significant. Dedicated portables are more reliable.

Do portable noise machines work on planes?

Somewhat — they mask high-frequency engine drone but can't eliminate low-frequency rumble. Noise-cancelling headphones are better for flights; portable machines are better for hotel rooms.

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