Usually not: whatever is left expires with the plan on the date stated. A few providers set different conditions, such as extending validity when you top up, but that has to be read plan by plan. If you travel often and want something more flexible, tell us how frequently you go and we will look at which options fit that pattern.

There is no single answer, because it depends on how even your usage is. If the days look alike, a daily plan is easier to live with and needs no monitoring. If the itinerary swings — a full day of work in a borrowed office, then a day of sightseeing — a pool gives more freedom. Estimate your real usage first, then compare the two on the same figure.

Yes, if the plan permits sharing — a condition written separately from the data amount, so check it before buying. If you do share, mark the connection as metered on the laptop; otherwise system updates and cloud syncing can take a large share of the pool within a few hours.

The method that works on any phone is the data counter in settings, reset on the day the plan starts; its location varies by manufacturer and OS version. Some providers also offer their own usage page, which is more accurate because it counts from the network side. If you are not sure whether your plan has one, ask us.

Not necessarily, because anything unused expires with the plan, so buying far above your needs is paying for something you will not use. A more balanced approach is to estimate from the real itinerary, take the next size up from that estimate, and check in advance whether the plan can be topped up so you have a route out if the estimate was wrong.