应该买多少流量？

Check your app or plan management page to see whether you can top up or buy a new plan straight away. If not, contact support on LINE or by email as listed on the contact page.

Buying too large a margin means paying for data you may never use. Calculating from real activity usually lands on a better-value size, but if you are unsure of your own habits, some margin still beats running out mid-trip.

Generally each plan has its own validity period, and any unused data expires along with that plan. Always check the validity terms on the plan page before buying.

It helps considerably, since a pre-downloaded map uses only a small amount of data for positioning compared with loading a live map constantly. It suits routes you already know you will take.

Both sit in the heavy category. The actual amount used depends more on the resolution the app has set and how long you use it, than on the type of activity alone.

Lowering video resolution in streaming apps, turning off background app updates while on mobile data, and disabling autoplay video in social feeds all genuinely reduce daily data use.

It is worth some consideration, since large updates can use an unusually high amount of data. A safer approach is to set updates to run only on Wi-Fi and disable automatic updates over mobile data while travelling.

Yes. The hours before boarding and after landing are usually heavier than an ordinary day: checking the gate, messaging whoever is meeting you, booking a ride, working out how to get out of the airport. Leaving the flight days out of the sum tends to leave you short exactly when demand peaks.

It might be, but it bets the trip on something you cannot check in advance. Accommodation Wi-Fi varies enormously and nobody can guarantee it. The safer approach is to size for the hours you spend outside the room and treat the Wi-Fi as the thing that leaves you with a surplus rather than the thing that makes the number work.

Noticeably more than typing text in, because the phone keeps sending frames for processing the whole time you hold it up. The exact amount depends on the app and its settings, but if you expect to lean on it because you cannot read the local script, download the offline language pack while you are still on Wi-Fi.

Estimate it in segments, because moving days and first days in a new country run higher than settled days — navigation, finding a bed, dealing with paperwork. Add the segments together and leave extra for the border-crossing days. Whether one plan covers all three countries depends on the specific plan, so check its coverage details, as terms differ between suppliers.

Leftover data does not carry into the next plan, so an oversized margin is money genuinely spent. That has to be weighed against the cost of losing connectivity mid-trip. The better habit is to record what you actually used this time and start from that figure next time, so each trip sharpens the estimate.