徒步和国家公园，网络该怎么准备
把没有信号当成默认状态，再从这个前提往下准备。
快速解答
- Download maps and routes beforehand and plan as though there will be no signal at all.
- Tell someone your route and return time, because calling out from the trail may be impossible.
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常见问题
Does a bigger plan give better signal in the backcountry?+
No. The size of an allowance has nothing to do with signal strength or coverage. The allowance is how much data you may use; the signal is whether a mast is within range and in view. If there is no mast in the area, no plan size changes that. What genuinely helps is offline preparation and planning as though there will be no service.
Does GPS still work in airplane mode?+
On most phones it does, as long as location services stay enabled, because GPS only receives from satellites and sends nothing out. Offline maps and the position marker keep working. The behaviour varies a little by brand and OS version, so the clearest check is to test at home: switch on airplane mode and see whether the marker still follows you as you walk.
When should I install an eSIM if the trip starts in a city and moves into a park?+
Install while you are still on Wi-Fi at home or at your city accommodation, because installation itself needs a connection. Activate when you actually need the data. If you are unsure whether validity begins at installation or at first connection, check the supplier's terms before buying, because this differs from one supplier to another.
Is a spare phone or a second power bank the better thing to carry?+
It depends which failure worries you more. A power bank solves one problem: running out of charge. A charged spare phone kept switched off covers a dead battery and also a broken, drowned or lost handset. For a day walk near a town a power bank is usually enough; on multi-day or isolated routes a spare device is the more sensible redundancy, especially if it also holds the offline maps.
Near a border, will my phone latch onto the other country's network?+
It can happen, because the phone picks whichever network it hears most strongly, not whichever country it is standing in. On a ridge with a clearer view of the far side, it may register there. What follows depends on whether your plan covers that country. If your route hugs a border, the safer options are a regional plan covering both sides, or selecting the network manually in the mobile network menu.
How can I tell which points on a route are likely to have signal?+
There is no perfectly accurate method, but the principles hold. High open ground beats valley floors and dense canopy. Points with a view of a town or a main road beat points behind a ridge. Areas near the park office or the car park usually have service because people are there permanently. Note those spots while planning and treat them as places to try, not places that guarantee a connection.
常见问题
Which plan covers remote areas best?+
We do not claim any plan or operator is best in remote areas: it depends on the specific location. Use local operators' coverage maps as a guide and always prepare offline.
Is a second phone worth carrying?+
On multi-day or isolated routes, a fully charged spare kept switched off is reasonable redundancy, covering both a dead battery and a damaged handset.