在国外用 5G：可以合理期待什么
漫游时能不能用上 5G，同时取决于三件事：手机、当地网络，以及运营商之间的协议。
快速解答
- Three things must line up: the handset supports the bands used there, the network serves that spot, and the roaming agreement includes 5G.
- Seeing 4G where 5G exists is normal in roaming and not a fault in the plan.
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| Symptom | Likely cause | What to check |
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| Aspect | Within our control | Outside our control |
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| Symptom | Plausible cause | What to check |
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| Variable | Who decides it | What you can do |
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常见问题
Does an eSIMonline plan guarantee 5G speeds?+
No, and we will not guarantee something we do not control. The speed you get depends on three things at once: whether your handset supports the frequencies in use there, whether the network you roam onto offers 5G to visitors, and how busy that area is at that moment. What we can tell you is what each plan states, as specified by the upstream supplier. If anything is unclear, ask before you buy.
Should I lock the phone to 4G to save battery?+
It is a reasonable choice in some situations, particularly at the edge of 5G coverage where the phone flips constantly, since repeated searching and switching costs more power than sitting attached. Where 5G coverage is solid, though, locking to 4G rarely saves much and gives up speed for nothing. The important part is remembering to set it back, because that preference survives into the next trip.
Why does my friend beside me have 5G when I do not?+
The most common reason is that you are on different networks, which follows from different plans or different upstream suppliers. Next most likely is different handsets with different band support, and after that a setting on one phone limiting the network type. Start by comparing the network names in both status bars; if they differ, you have your answer.
The speed test looks great but everything still stutters. Why?+
Because download speed is not the only thing that shapes the experience. Latency and consistency matter more to video calls and maps than a peak figure does. Speed-test apps measure a short burst against a nearby server, which does not represent sustained traffic crossing borders. Judge by the work you actually need to do rather than by the number.
If 5G coverage in my destination is patchy, what should I buy?+
Choose first on the data volume and the number of days that match your trip, and treat network type as secondary, because stable 4G handles maps, messaging, email and ordinary video calls perfectly well. If your work involves regularly uploading large files, plan a fallback such as accommodation Wi-Fi or a co-working space; that is more dependable than hoping for good 5G every day.
常见问题
The icon says 5G but it is not fast. Why?+
The icon shows which system you are attached to, not the throughput, which still depends on congestion and roaming priority.
Does turning 5G off help?+
Where 5G is weak and the phone keeps switching, locking to 4G can be steadier and easier on the battery. Compare for a day.