Plan as if your phone will drop out at some point on the trip. Towns are the likeliest places to find a signal, but valleys, high passes and scenic areas can leave you with none. Save maps, tickets and addresses offline before you set out.
If you are travelling with parents or a camera bag and a tight schedule, an empty screen on a mountain road is a fair worry. A short offline routine takes the sting out of it.
Where is the signal most likely to fail?
It tends to fail where terrain blocks the signal, away from towns. Scenic trips in Yunnan and Sichuan climb into exactly those places.
| Place | Height | What to plan for |
|---|---|---|
| Lijiang Old Town | 2,400 m | A town, so signal is likeliest; still save tickets offline |
| Shangri-La | about 3,160 m | Save everything offline before day trips out of town |
| Songpan | about 2,867 m | Charge fully and save the day’s route before heading out |
| Jiuzhaigou Valley | about 2,000 m to 4,500 m | Booked online in advance, so save the ticket first |
Heights are listed on the sources linked below the page[1][2][3][4]. The signal itself changes with the network and the weather, so treat the table as a planning aid, not a coverage map.
What should you download before you go up?
Do this on hotel Wi-Fi the night before, not on the road.
- An offline map area for your day. Apple Maps remains functional in mainland China[5], and our map guide covers the Chinese apps.
- Your tickets and booking codes as screenshots. Jiuzhaigou tickets are booked online in advance under real names, with no ticket window at the scenic spot[6].
- Your hotel name and address in Chinese, from your bilingual info sheet.
- An offline translation app, set up as in our translation guide.
How do you keep in touch with family?
Agree a plan before the day starts. Tell your group where you will meet, what time, and what to do if someone is late. Foreign messaging apps are blocked in mainland China[7], so decide which app you will use and test it.
Check the eSIM, roaming and local SIM comparison if you want a second connection as a backup.
What if something goes wrong?
Save emergency numbers where you can see them without a signal. The ambulance and medical number is 120[8], and the police number is 110[9]. China has no single 911-style number, and operators mostly speak Mandarin[10], so keep a written phrase ready.
Our emergency numbers and health phrases page has phrases to screenshot. For altitude-heavy routes, also read the other checklists on the preparation topic page.