Mobile data not working in China?
Recover safely.
If your eSIM is not working in China, start with the symptom you can see. Confirm the intended data line, the plan state and the provider’s instructions before touching APN, manual network selection or any reset.
- 01Name the symptom
- 02Check the data line
- 03Check the plan
- 04Change one setting
- 05Stop before resets
Preserve the eSIM. Get somewhere safe first.
Do not delete the eSIM, reset the phone or turn on chargeable home-line roaming just to reach your hotel. Use saved addresses, an official airport or station desk, trusted venue Wi-Fi, an authorised companion hotspot, or your offline payment and transport backups.
The first two minutes: reversible checks only
Test after every step. Once ordinary webpages load, stop changing settings. Menu names vary by phone, OS version, region and carrier.
- 01
Save what the phone shows
Screenshot the status bar, exact error and selected line. Hide phone numbers, QR codes, order numbers, ICCID, EID, IMEI, account details and precise location before sharing.
- 02
Turn Wi-Fi off for one clean test
A Wi-Fi network with no internet can hide the mobile-data result. Open one ordinary webpage over mobile data. Turn Wi-Fi back on when finished.
- 03
Cycle Airplane Mode once
Turn it on, wait about 30 seconds, turn it off, then wait for registration. Do not repeat this endlessly; one controlled cycle is enough for the first pass.
- 04
Confirm mobile data and the intended line
Mobile/Cellular Data must be on. On a dual-SIM phone, select the travel eSIM or the exact roaming line you intended—not simply the line used for calls or SMS.
- 05
Check roaming only on that line
Turn Data Roaming on only when the provider says the product needs it. Keep the home line out of mobile-data use unless you deliberately accept its current roaming terms and charges.
- 06
Restart once
If the settings are correct but registration still has not changed, restart once. Stop repeated restart loops and move to the symptom tree.
Stop condition: data works, the provider’s instructions differ, a SIM PIN/PUK is requested, or the next action would delete, reset, buy, activate chargeable roaming or accept new terms.
No Service / SOS / Emergency calls only
Check line enabled → plan/account → automatic network → providerBars and 4G/5G/LTE, but nothing loads
Check data line → roaming → plan balance → provider APNAnother ordinary webpage or app still loads
Data path exists → check that service and lawful access boundaryConnected to hotel/airport Wi-Fi, no internet
Open login page → ask the Wi-Fi operator → use a safe backupNo signal and no data are different failures
01No Service, Searching, SOS or emergency calls only
The line is not currently registered for normal service. Confirm the profile appears, the line is enabled, the plan/account is usable and automatic network selection is on. Move to manual selection only if the provider names current partner networks. If the line is missing or shows a SIM error, contact the provider; do not rescan or delete it.
02Signal bars or 4G/5G/LTE appear, but nothing uses data
Radio registration is not proof that mobile data is usable or that the plan has started. Check which SIM owns mobile data, Data Roaming for that specific line, the provider dashboard for activation/expiry/data remaining, and only then the provider-supplied APN.
03The eSIM is listed, but its line is off or not selected
Enable that line and select it as the mobile-data line. Calls, texts and data can each have different defaults. Disable automatic data switching unless you intentionally want another line to take over and understand its charges.
04The plan looks installed, but activation or data status is unclear
Installed, enabled, registered, activated and data remaining are separate states. Check the provider’s own order or account screen for start trigger, validity, coverage area, balance, speed policy and device restrictions. Purchase date, installation, first network registration and first data use are not interchangeable triggers.
05Data is intermittent or very slow
Record place, time, network name and whether 4G/LTE is steadier than 5G. A temporary 4G/LTE test can diagnose a 5G compatibility or coverage edge, but return to the provider’s recommended mode afterward. Do not disable VoLTE or emergency features as a generic speed fix.
“Installed” does not mean “ready for data”
Read the phone and the provider account together. A checkmark at one stage does not prove the next stage.
- 1InstalledThe profile appears in SIM/eSIM settings.
- 2EnabledUse this SIM / Turn On This Line is on.
- 3SelectedThis is the current mobile-data line.
- 4RegisteredA permitted network name or signal appears.
- 5UsableThe plan is active, in area, in date and has data.
Check the provider account
Plan name, order state, supported territory, activation trigger, start/end time, data remaining, throttling or fair-use notice, and hotspot allowance.
Check the phone
Profile present, line enabled, selected for data, roaming set as instructed, registered network, APN only if supplied.
Do not assume SMS exists
Data-only plans may have no usable phone number, voice or SMS. Keep the home line for incoming SMS only if its carrier terms make that safe.
Expect product differences
A travel plan’s data may exit in another country or region. That can affect IP location, latency, account risk checks or service availability; only provider documentation can confirm the product.
iPhone: follow the labels you actually see
Apple uses Cellular or Mobile Data depending on language and region; Chinese interfaces may show 蜂窝网络 or 移动数据. The exact path changes with iOS version and the number of active lines.
Cellular / Mobile Data → SIMs
Tap the intended line and confirm Turn On This Line (启用此号码/打开此线路). Go back to Cellular Data (蜂窝数据) and select that same line. Treat Allow Cellular Data Switching (允许切换蜂窝数据) as a cost-sensitive option, not a default fix.
Intended line → Cellular Data Options
Look for Data Roaming (数据漫游). Enable it only when that plan’s provider says it is required. Do not assume the switch belongs to every line; in dual-SIM mode, open the specific number or label first.
General → About
Carrier Lock / Network Provider Lock (运营商锁) should show the local-language equivalent of “No SIM restrictions” for use with another carrier. Only the locking carrier can unlock it. Also check for a carrier-settings update while on trusted Wi-Fi.
Cellular → app list
If only one app has no data, confirm cellular access is enabled for that app. This setting cannot explain a failure across every browser and app.
Enabled is not the same as selected for data.
Open the travel line first, then return to Cellular Data and select that same line. Labels move across iOS versions and regions.
Android: Pixel and Samsung paths differ
Android makers rename and move settings. Search Settings for SIM, mobile data, roaming, APN or network operator when the exact path is absent. Chinese labels may include SIM 卡, 移动数据, 漫游, 接入点名称 and 网络运营商.
Settings → Network & internet → SIMs
Select the intended SIM, turn on Use this SIM and Mobile data, then choose it as the data default. Google notes that only one SIM can be the default for data. Roaming, preferred network, network operator and APN may appear within the same SIM’s mobile-network settings.
Settings → Connections → SIM manager
Enable the eSIM/SIM and select it under Preferred SIMs → Mobile data. Review Auto data switching before leaving it enabled. Network mode, roaming, APN and network operators are commonly under Connections → Mobile networks.
Use visible labels, not a guessed path
Xiaomi, Oppo, Vivo, Honor, Motorola and carrier-customised phones can differ. Record the phone maker, exact model, Android version and screen wording, then use that maker’s official support instructions.
Temporary 4G/LTE test: if registration or data is unstable on 5G, select 4G/LTE only long enough to compare. Restore the recommended mode afterward. Do not change VoLTE, emergency-calling or unknown radio settings without provider/device guidance.
Use the labels you see, not a memorised menu.
Pixel commonly starts at Network & internet → SIMs. Galaxy commonly separates SIM manager from Mobile networks.
APN, network selection and compatibility
APNOnly enter an APN supplied for this exact plan
First photograph or write down the current values. Apple warns that an incorrect APN can remove data connectivity and may create extra charges; some carriers hide the menu. Never paste a “universal China APN” from a forum. Change only the fields the provider names, save once, test once, and restore or stop if the result is worse.
NETLeave network selection automatic unless the provider says otherwise
Automatic selection is the safe default. If the provider lists current partner networks for this product, turn automatic off temporarily and try only those names. Wait for a result and record it. Do not cycle through every network repeatedly or assume one Chinese network is always the partner.
LOCKA carrier-locked phone cannot simply be fixed in settings
On iPhone, check Carrier Lock/Network Provider Lock in General → About. On Android, the lock state and wording depend on the seller and carrier. Only the carrier that applied the lock can remove it; do not pay an unofficial unlocker or attempt to alter device identifiers.
MODELModel, region variant and frequency support all matter
Confirm the exact model number—not just the marketing name—against the phone maker and provider compatibility list. eSIM support and radio bands vary by market and carrier. A 5G icon also does not prove an active 5G data session.
If the provider did not give you an APN, stop here.
Let the line register without guessing.
- Partner name from provider
- Wait for one result
- Stop repeated switching
One app, Wi-Fi login and hotspot failures
Prove the data path first
Try one neutral webpage and another ordinary app. If they load, the phone has data. Check the affected app’s cellular permission, account error and official service status. Network access in mainland China is regulated and changes; this guide does not provide circumvention advice or promise any service will work.
Connected is not authenticated
Hotel and airport Wi-Fi may open a captive login page, request terms, an account or sometimes a phone number. Open the network’s sign-in notification or a fresh browser window. If you cannot complete the required method, ask that Wi-Fi operator for an official alternative.
The plan may control tethering
First prove mobile data works on the phone. Then confirm the plan allows hotspot/tethering. Check the hotspot password and try 2.4 GHz compatibility where the device supports it. Do not bypass provider restrictions.
Separate host from client
If another device can use the same hotspot, troubleshoot the failing client’s Wi-Fi. If no client has internet but the host does, check the plan’s hotspot allowance and device-maker instructions.
Get to accommodation without fixing the phone first
The safest next step may be physical navigation, not another setting change.
Personal safety: do not hand an unlocked phone to a stranger. If help is needed, keep the phone in your hand, show only the necessary screen and hide private notifications.
Who to contact—and what to prepare
Prepare a privacy-safe support packet
- Exact time, city and a broad place such as “airport arrivals”—not a live precise location.
- Phone maker, exact model, region variant, OS version and whether it is carrier-locked.
- Plan/product name, purchase or order status, and how validity is shown—mask most of the order number.
- Line label selected for data, roaming state, signal icon, visible network name and exact error text.
- Steps already tried, in order, and whether anything changed.
Stop before these steps
Risk: the profile or QR may not be reusable. Stop: wait for the eSIM provider to confirm reissue or reuse in writing.
Risk: saved Wi-Fi, passwords, mobile, VPN or APN settings can be removed or reset depending on device. Stop: save the configuration and get provider/device guidance.
Risk: apps and local data are erased, and eSIM handling depends on the reset choice/device. Stop: never use it as an arrival-day connectivity shortcut.
Risk: wrong values can break data or create unexpected charging. Stop: one provider-supplied configuration, one test, then restore or escalate.
Risk: wastes battery and does not create roaming entitlement. Stop: try only documented partner networks, then return to automatic.
Risk: unexpected charges. Stop: check current carrier terms and knowingly accept the cost before enabling data on that line.
Risk: repeated wrong entries can permanently block the SIM/eSIM. Stop: contact the issuing carrier.
Risk: account, payment and identity exposure. Stop: keep the device in hand and use an official support point.
Five frames to follow when the phone has no data
- 01Name the symptom
- 02Select the intended line
- 03Check the exact plan
- 04Change one safe setting
- 05Escalate or travel offline
Mobile data recovery FAQ
Why does my phone show signal bars in China but have no mobile data?
Signal bars only show that a line can see or register on a radio network. Data can still fail because the wrong SIM is selected for data, roaming is off when the plan requires it, the plan is not active, the APN is wrong, or the account has no usable data. Check the selected data line and provider status before changing advanced settings.
Should data roaming be on for a travel eSIM in China?
Only if the travel-eSIM provider or home carrier says the specific plan needs roaming. Turn it on for the intended travel line, not automatically for the home line. Roaming on the home line can create charges depending on that carrier and plan.
Should I delete and reinstall an eSIM that is not working?
No. Do not delete an eSIM as an early troubleshooting step. Apple explicitly warns that deleting an eSIM may require a new one from the carrier, and QR-code or installation reuse rules vary by provider. Contact the provider first.
Why do only some apps or websites fail while other mobile data works?
If a neutral webpage and another ordinary app load, the phone has a data path. A single service can still fail because of that service, its account checks, the network path or the plan’s data routing. This is not the same symptom as having no mobile data at all. Use official, lawful support channels and do not treat a VPN change as a universal fix.
Can a data-only eSIM receive verification text messages?
Not necessarily. Many travel plans are data-only, but the exact product description is the authority. Do not wait for a bank, payment-app or hotel Wi-Fi SMS on a line unless the provider explicitly says that line has a phone number and SMS service.
Will resetting network settings fix mobile data?
It can help in some device-support workflows, but it is not a first-line step. Depending on the phone it can remove saved Wi-Fi networks and passwords and reset cellular, VPN or APN settings. Save the current configuration and ask the carrier or device maker before using it.
How do I activate an eSIM after arriving in China?
Follow the activation trigger and partner-network instructions for the exact product. First confirm that the profile is installed, the line is enabled and selected for data, and the phone has registered on an allowed network. Do not assume installation started the plan, and do not rescan or delete the profile unless the provider confirms that is safe.
Save the recovery path offline
Keep the hotel address, provider instructions, plan details, support channel and an offline payment/transport backup available before leaving Wi-Fi.
Review the first-hour connectivity plan →How this guide was checked
Reviewed 18 August 2026 for short-stay international visitors using an already purchased eSIM, home-carrier roaming plan or physical SIM in mainland China. Apple, Google and Samsung documentation controls the device-operation baseline. Doubao and DeepSeek separately reviewed the same China-specific and device-step questions as secondary research; unsupported provider names, universal roaming-cost claims, fixed retry or installation counts and unverified model or venue claims were rejected. Provider-specific activation, APN, partner network, charges, coverage, hotspot and reinstallation rules remain conditional. Read our editorial policy.
- Apple Support — If you see SOS, No Service, or SearchingPublished 23 June 2026; line status, roaming, carrier-settings update and carrier escalation.
- Apple Support — Cellular data roaming optionsCurrent in 2026; dual-SIM roaming path, 30-second Airplane Mode cycle and carrier-cost caveat.
- Apple Support — View and edit your APNPublished 23 June 2026; incorrect-APN risk and carrier-only values.
- Apple Support — Erase an eSIMPublished 23 April 2026; do not erase for troubleshooting unless the carrier directs it.
- Apple Support — Use eSIM while travelling internationallyPublished 10 March 2026; data-line choice, carrier lock and model/region compatibility.
- Google Pixel Help — Connect to mobile networksAccessed 18 August 2026; dual-SIM defaults, roaming, APN, operator choice and network-mode variation.
- Google Pixel Help — Fix mobile connectivity issuesAccessed 18 August 2026; data checks and reset consequences/escalation boundary.
- Google Pixel Help — Fix Wi-Fi connection problemsAccessed 18 August 2026; captive-portal and hotspot diagnosis.
- Samsung Support — Poor signal and mobile dataAccessed 18 August 2026; SIM manager, automatic operator selection and UI-variation notice.
- Samsung Support — Galaxy SIM manager and eSIMAccessed 18 August 2026; line activation, preferred SIM and auto-data switching.