Stream over Wi-Fi instead of mobile data

All data is not equal. The energy it takes to move a gigabyte depends a lot on how it travels, and the mobile network is the hungry route. Reaching a phone mast, especially when the signal is weak and your handset is straining to connect, takes meaningfully more energy than the same gigabyte gliding over your home broadband and router. Streaming video is where this bites, because video is by far the heaviest thing most of us do online — a single evening’s binge can move several gigabytes.

So the habit is simple: do the data-heavy things — streaming, downloads, updates, backups — on Wi-Fi, and save mobile data for the light stuff like maps, messages and the odd web page. It’s the same content either way; only the pipe changes.

One honest caveat: the exact energy gap between mobile and Wi-Fi varies by network, generation and how busy things are, so treat the savings as real but not precisely measurable. And there’s a happy overlap with your wallet — streaming is precisely what burns through a data allowance, so the greener choice here is also the one that keeps your phone bill small and stops that mid-month “you’ve used 80% of your data” warning.