Apps adjust resolution during playback according to the connection, and busy, fast-moving footage carries more information than a static scene at the same resolution. Between them, two clips of equal length can differ noticeably without you touching a setting.

No. It counts only the activity you selected. Mail syncing, app updates, incoming messages and automatic photo backup are all separate. In practice, set aside a slice of the allowance for background work before converting the rest into hours.

A little, but the main benefit is confidence rather than savings, since following a set route is already light. What offline maps really give you is a way to keep navigating when the signal disappears in a tunnel, indoors, or in a weak-coverage area.

Measure it. Reset the eSIM line's statistics, run the activity with your real settings for ten minutes, then scale the increase up to an hour. The result reflects your app, your settings and your network, so it beats any midpoint written into a formula.

There is no single right figure, but the principle holds: do not plan to finish the allowance exactly on the last day. Something unplanned always turns up — a cancelled train that needs a new route, a document to send. A reserve means you are not making those decisions on an almost-empty allowance.