Verdict: Turn Wi-Fi off and try two unrelated websites on the phone before changing any network settings. If both fail despite signal bars or working calls, check the selected mobile-data line and carrier account; if only one app fails, check that app’s data permission first. Save a network reset for after these tests because it changes saved connections.
This guide is for a phone that appears to have cellular service but cannot use the internet on the phone itself. A call may still work while cellular data does not, so a successful call is useful evidence, not proof that your data plan or data route works. If the phone shows No Service or Searching, start with that narrower guide. If the phone browses but a connected laptop cannot, use our hotspot no-internet guide instead.
Find out what is failing in three minutes
- Take Wi-Fi out of the test: Turn Wi-Fi off, leave airplane mode off, and open two unrelated websites in the phone’s browser. A Wi-Fi connection can hide whether cellular data works. Google recommends comparing Wi-Fi and mobile data when diagnosing Android internet failures. Android internet troubleshooting explains the comparison.
- Compare services: Try a regular voice call and an ordinary SMS, then note whether all internet apps fail or just one. A messaging app may work over Wi-Fi or use a different service, so test with Wi-Fi off.
- Check the account: On Wi-Fi or another device, look for a carrier outage, plan suspension, exhausted allowance, roaming restriction, or line change. Do not assume signal bars verify that mobile internet is provisioned.
| Observed result with Wi-Fi off | What it suggests | Next action |
|---|---|---|
| Two websites and all internet apps fail, but calls work | The voice service is available; the selected data line, data allowance, network, or device data settings still need checking | Check mobile data and the carrier account |
| Websites open, but one app fails | The cellular route works for the browser | Check that app’s cellular-data permission and its own service status |
| Only one of two SIMs or eSIMs fails | A line selection, activation, plan, or carrier issue may be involved | Confirm which line is selected for data and test each active plan separately |
| Data works in one location but not another | Coverage or a local carrier fault is plausible | Check the carrier’s coverage/outage information and retest elsewhere |
| The phone says No Service, SOS, or No SIM | The issue is broader than a usable data connection | Follow the matching service or SIM guide instead |
| The carrier confirms service, but the same SIM works in another compatible phone | The original phone or its configuration needs closer attention | Contact device support after documenting the comparison |
1. Check that mobile data is on for the right line
On iPhone, open Settings > Cellular and make sure Cellular Data is on. If you use two lines, tap Cellular Data and confirm the selected line has an active data plan. Apple notes that cellular options and roaming controls depend on model, carrier, and region. Also check whether the affected app is switched off in the per-app cellular list; when it is, that app uses Wi-Fi only. See Apple’s cellular-data settings guide and Dual SIM line selection.
On a Pixel, Google’s current path is Settings > Network & internet > SIMs: turn on Mobile data, choose the carrier, and confirm Use SIM is on. On Galaxy, Samsung documents the mobile-data control under Settings > Connections > Data usage; exact labels vary by model and software. Do not switch off an active work or travel eSIM casually. Note the current line selection before making a change so you can restore it. Pixel mobile connectivity guidance and Samsung’s data-usage guide provide the manufacturer paths.
If a newly installed eSIM is missing, inactive, or shows No Service, that is an activation problem rather than an ordinary data toggle. Use the eSIM activation and no-service checklist and contact the carrier if the line has not been provisioned.
2. Separate a weak or blocked data route from a temporary connection fault
Move to a place with better reception, turn airplane mode on and back off once, and retry the two websites. Restart the phone if the result has not changed. Google recommends checking signal strength with Wi-Fi off and trying airplane mode or a restart for mobile connectivity problems. A signal icon indicates radio reception, not the speed or reliability of an active data session. Google’s Pixel connectivity guide gives the sequence.
Check whether the problem is local: try again in another area or ask the carrier to confirm its current outage and coverage status. If you are traveling, verify whether your plan includes data roaming before enabling it; roaming can add charges. Apple and Google both describe data and network settings as carrier- and region-dependent. Do not change a preferred network type or APN from a random online checklist. Use carrier-provided settings if the carrier identifies a configuration issue.
3. If the browser works, troubleshoot only the failing app
A successful browser test rules out a complete mobile-data outage at that moment. On iPhone, scroll through Settings > Cellular and turn on cellular access for the affected app if you want it to use your plan. If other apps work but that app still does not, check its service status, update it through the official app store, and review any sign-in error displayed in the app. Apple’s per-app cellular controls support this check.
On Android, app data restrictions and Data Saver behavior vary by device and app. On Galaxy, Settings > Connections > Data usage includes Data saver and, on supported models, Allowed networks for apps; an app set to Wi-Fi only will not use mobile data. Check the affected app’s setting rather than disabling systemwide protection blindly. If the app also fails on Wi-Fi, it is less likely that the cellular network is the sole cause. Keep the diagnosis at the app level unless other services fail too. Samsung’s data-usage guide explains these controls.
4. Check the carrier before resetting the phone
If two websites fail with Wi-Fi off after checking the correct data line, ask your carrier to confirm that mobile data is active on the plan, that the allowance has not been exhausted or restricted, and that there is no outage or provisioning problem. Report whether voice calls and SMS work, the location, the displayed network type, whether one or both SIMs are affected, and when the failure began. Google recommends contacting the carrier when mobile connectivity checks do not resolve the issue. Google’s escalation guidance covers that step.
If the carrier confirms the account and network, a network-settings reset becomes a reasonable later test. On Pixel, Google lists Settings > System > Reset options > Reset mobile network settings. Samsung lists Settings > General management > Reset > Reset mobile network settings and warns that customized carrier APN settings may need to be re-entered. On iPhone, use Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings, not Erase All Content and Settings. Apple’s network reset removes saved Wi-Fi networks, VPN settings not installed by a profile, and other network settings; record needed passwords and configurations first. Pixel reset steps, Samsung’s warning, and Apple’s reset effects explain the differences.
When to seek carrier or device help
Contact the carrier first if the line is new, roaming, suspended, out of data, or failing in one coverage area, or if other people on the same carrier are affected. Contact the phone maker or authorized service provider if the carrier confirms the line is healthy, the same SIM or eSIM plan works in another compatible phone, and the original phone still cannot use data after the low-risk checks. A cross-phone comparison is useful evidence, but it does not by itself prove a hardware defect. Keep another working connection available before traveling or depending on the phone for urgent communication.
If the phone itself browses normally but a laptop connected to its hotspot does not, return to the hotspot-specific checks. If the phone is instead joined to Wi-Fi that has no internet, use the separate Wi-Fi connected/no-internet guide. Those conditions lead to different next steps.
Editorial note: This is a research-based diagnostic guide synthesized from manufacturer support documentation. No phone, network, or carrier plan was tested for this article; menu names and service conditions may differ by model, software, region, and plan.
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