Why Is My Cellular Data Not Working on iPhone or Android?
Cellular data stops working due to a toggled setting, Airplane Mode being on, a weak signal, a reached data limit, or a SIM card issue. Most fixes take under two minutes. Check your settings first, restart your phone, and reset network settings if needed.
Your apps will not load. Messages are failing to send. The 4G, 5G, or LTE icon has disappeared from the status bar. Why is my cellular data not working is one of the most searched phone questions globally, and the answer is almost always one of four fixable causes. Why is my data not working rarely points to a hardware fault. In most cases, the fix takes under two minutes and involves a setting that has been accidentally toggled, a SIM that needs reseating, or a plan that has hit its limit.
This guide covers every common fix for both iPhone and Android, ordered from simplest to most involved, and ends with how to avoid cellular data problems entirely when travelling abroad.
Why Does Cellular Data Stop Working?
When cellular data is not working, the problem almost always falls into one of these four categories.
Settings issue
Cellular data has been toggled off, Airplane Mode is on, data roaming has been disabled, or a specific app has been blocked from using mobile data. These are the most common causes and the easiest to fix.
Signal and coverage issue
When the cellular network not available message appears, or signal bars drop to one or zero, your phone cannot reach the carrier network regardless of your settings. Basements, elevators, rural areas, and thick-walled buildings all block or weaken the signal.
SIM card issue
A physical SIM card that is slightly misaligned, dirty, or damaged can break the connection to the carrier network. This can happen after dropping the phone or after inserting and removing the SIM multiple times.
Account and plan issue
A monthly data limit reached, a missed payment, a carrier outage, or a line suspension can all cut off cellular data with no warning on the phone itself.
The phone may show full signal bars while the account is suspended, which is one of the more confusing scenarios to diagnose.
How to Fix iPhone Cellular Data Not Working
These fixes are ordered from simplest to most involved. Work through them in sequence. Most iPhone cellular data not working issues resolve at Fix 1, 2, or 7.
How to Turn Mobile Data on iPhone
This is the most common cause. Cellular data can be toggled off accidentally.
📍 Navigation Flow
Settings → Cellular → Cellular Data (Confirm ON)
Alternatively, swipe down from the top-right corner to open Control Center and tap the cellular signal icon. Green means data is on. Grey means it is off.
Turn Airplane Mode Off (or Toggle It)
📍 Navigation Flow
Settings → Airplane Mode (Confirm OFF)
Airplane Mode disables all wireless connections and is easy to activate accidentally. If it was already off, toggle it ON, wait 10 seconds, then toggle it OFF again. This forces the iPhone to drop and re-establish its connection to the carrier network. Alternatively, swipe down for Control Center to toggle the icon.
Check Your Signal Strength
Open Control Center and look at the signal bars (📶) in the top-left corner. One bar or zero means the connection is too weak to sustain mobile data. Move to an open area, near a window, or outside. If the status bar shows No Service or SOS, the iPhone is not connected to any network at all.
How to Check Data Usage on iPhone
If your plan has a monthly data limit, reaching it will cut off mobile data silently with no notification.
📍 Navigation Flow
Settings → Cellular → Scroll to Bottom (Current Period)
If you have used your full allowance, contact your carrier to top up. Tap Reset Statistics at the start of each billing cycle to keep an accurate monthly total.
Enable Data Roaming
Roaming prevents connections outside your home coverage area unless specifically enabled.
📍 Navigation Flow
Settings → Cellular → Cellular Data Options → Data Roaming (ON)
Standard roaming charges apply unless you have an international plan active. Read the Avoid Roaming Charges section below before enabling this.
Check for a Carrier Settings Update
📍 Navigation Flow
Settings → General → About (Wait for prompt)
Carrier updates fix network compatibility issues separate from iOS updates. If a prompt appears, tap Update, then restart your iPhone and test cellular data.
Restart Your iPhone
A restart clears temporary software glitches. Press and hold the Side button + Volume until the power slider appears. Drag to power off, wait 30 seconds, then hold the Side button to restart. Test data once the phone has fully booted.
Remove and Reinsert Your SIM Card
A physical SIM card that is misaligned can interrupt data. Power off completely. Use a SIM eject tool to open the tray on the side. Remove the SIM, wipe the metal contacts gently with a dry cloth, reinsert carefully, and restart.
Reset Network Settings
This will delete all saved Wi-Fi passwords and Bluetooth pairings. Reconnect manually after the reset. Use this step only after earlier fixes have failed.
📍 Navigation Flow
Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings
This returns all stored network configurations to factory defaults. Enter your passcode if prompted; the phone will restart automatically.
Update iOS
📍 Navigation Flow
Settings → General → Software Update
Outdated versions can cause carrier compatibility issues. Connect to Wi-Fi, install any available update, and restart to test cellular data.
Contact Your Carrier
If no fix has worked, the issue is likely with your account or your carrier's network infrastructure.
Check Live OutagesSearch your carrier's name on Downdetector.com to check for local outages. If no outage is reported, call support to confirm your account is active and your data plan is enabled.
Also Read
Which iPhones Support eSIM?
Check which iPhone models support eSIM before you travel, including dual SIM compatibility and setup basics.
Low Data Mode on iPhone
Learn what Low Data Mode does, when to use it, and how it can affect app updates, background activity, and mobile data use.
How to Prevent Roaming on iPhone
A simple guide to stopping accidental roaming charges on iPhone with the right settings before you travel.
Data Roaming in the USA
Understand how data roaming works in the USA, when it applies, and how to avoid unnecessary charges on domestic and international plans.
How to Check Data Usage on iPhone
Learn how to check your iPhone’s data usage, monitor cellular consumption by apps, and manage settings to avoid exceeding your data limit.
How to Fix Android Mobile Data Not Working
Android settings paths vary slightly between manufacturers. The fixes below cover Samsung, Google Pixel, and most major Android devices. Android mobile data not working almost always resolves within the first four fixes.
Universal Device shortcut
Using a different brand like OnePlus or Xiaomi? Open Settings and use the search bar at the top for any keyword below to find the menu instantly.
How to Turn on Mobile Data Android
Confirm that mobile data is actually switched on before anything else.
Google Pixel
Settings > Network & Internet > Mobile Network > Toggle ON.
Samsung
Settings > Connections > Data Usage > Toggle ON.
Quick Panel
Swipe down from top > Tap Mobile Data icon.
Alternatively, swipe down from the top of the screen to open the Quick Settings panel and tap the Mobile Data icon if it appears greyed out.
Turn Airplane Mode Off (or Toggle It)
Swipe down to open the Quick Settings panel and check the Airplane Mode icon. If it is active, tap it to disable it. If it was already off, toggle it on, wait 10 seconds, and toggle it off again to force a fresh network connection. On stock Android, you can also go to Settings > Network & Internet > Airplane Mode.
Turn Off Wi-Fi Temporarily
On some Android devices, an active Wi-Fi toggle prevents mobile data from working even when the phone is not actually connected to a Wi-Fi network. The phone detects a saved network nearby and waits for it rather than switching to cellular. Swipe down and disable Wi-Fi entirely, then test whether mobile data works on its own. Re-enable Wi-Fi once confirmed.
Check Data Limit and Usage
Pixel / Stock
Settings > Network & Internet > Data Usage.
Samsung
Settings > Connections > Data Usage.
Others
Search "Data Limit" in Settings.
Review your current usage. If you have hit your plan's data limit, contact your carrier to top up or upgrade. Some Android devices allow a hard data limit that cuts off mobile data automatically when reached. If this has triggered, adjust or disable the limit from the same Data Usage screen.
Enable Data Roaming
If you are travelling internationally, data roaming may be off by default. Standard carrier roaming charges apply unless you have an international plan.
Pixel / Stock
Settings > Network > SIMs > Roaming.
Samsung
Settings > Connections > Data Roaming.
Warning
Check Avoid Roaming Charges below.
Check and Reset APN Settings
The Access Point Name (APN) is the configuration your phone uses to connect. Incorrect settings are common after switching carriers.
Samsung
Mobile Networks > Access Point Names > Reset.
Pixel
Network > Mobile Network > Advanced > APN.
Manual
Contact carrier for APN values.
If resetting to default does not work, contact your carrier directly and ask for the correct APN values to enter manually.
Restart Your Android Device
Press and hold the Power button until the power menu appears on screen. Tap Restart. Wait for the device to fully boot before testing. If the phone is frozen and will not respond, perform a force restart by pressing and holding Power + Volume Down together for 10 seconds until the screen goes dark and the device restarts.
Remove and Reinsert Your SIM Card
Power off your Android device completely. Remove the SIM card from the tray, wipe the metal contacts gently with a clean dry cloth, and reinsert it securely. Restart and test data.
Disable Battery Saver Mode
Android's Battery Saver mode restricts background data for most apps and can block cellular data from functioning correctly.
Pixel / Stock
Settings > Battery > Battery Saver > OFF.
Samsung
Settings > Device Care > Battery > Power Saving.
Tip
Add apps to exception list.
Reset Network Settings
This clears all saved Wi-Fi passwords, Bluetooth pairings, and network configurations. Use this step only after earlier fixes have not worked.
Pixel / Stock
Settings > System > Reset Options > Reset Wi-Fi.
Samsung
General Management > Reset > Reset Network Settings.
Final confirmation
Tap Reset Settings and confirm.
Check for a Software Update
Install any available update and restart. Outdated Android builds can cause network and carrier compatibility issues that a software update resolves silently. Check under Settings > System > System Update (Pixel) or Software Update > Download and Install (Samsung).
Contact Your Carrier
Search your carrier's name to check for outages. Check their official app, website, or social media accounts for service announcements.
Check Live OutagesIf no outage is active, call your carrier's support line to confirm your account is in good standing and your mobile data plan is active.
Travelling Abroad? How to Avoid Roaming Charges
Cellular data issues get more expensive when they happen abroad. In many cases, the problem is not that your phone is broken. It is possible that data roaming is off, your home plan does not include international data, or your phone has not connected properly to a local network.
Avoid Roaming Charges Before Departure
An eSIM for international travel gives you mobile data without needing a physical SIM swap. You install it before departure, activate it through a QR code, and your data works as soon as you land.
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Most Data Issues Fixed in Minutes
Why is my cellular data not working? It is a frustrating question with straightforward answers in most cases. A toggled setting, a SIM that needs reseating, or a plan that has hit its limit account for the vast majority of cellular data problems on both iPhone and Android.
Work through the fixes in order, starting with the simplest. In many instances, a simple toggle of Airplane mode or a device restart is all it takes to restore your connection.
The International Fix: If you are travelling internationally and asking why your data is not working abroad, the most reliable fix is a eSIM for international travel activated before departure: no roaming charges, no SIM swapping, and data that works from the moment you land.
FAQs
Why is my cellular data not working even though I have full signal bars?
Full signal bars confirm your phone is connected to the carrier network but do not confirm that mobile data is active or that your account is in good standing. Check that cellular data is toggled on in Settings, your data plan has not hit its monthly limit, and your account has no payment issues. A carrier outage can also produce this scenario: full bars, no data.
Why isn't my data working after a software update?
iOS and Android updates occasionally reset network settings or cause carrier compatibility issues. After a software update, confirm cellular data is still enabled, install any available carrier settings update (iPhone: Settings > General > About), and restart your phone. If the issue persists, reset your network settings using the steps above.
Why is my data not working for certain apps only?
Individual apps can be blocked from using cellular data independently of the main toggle. On iPhone, go to Settings > Cellular and scroll down to see which apps are permitted to use data. Toggle on any app that is switched off. On Android, go to Settings > Apps > select the app > Mobile Data and enable Background Data.
What does "cellular network not available" mean?
This message means your phone cannot find or connect to a carrier network in your current location. It is a coverage issue rather than a settings problem. Move to an open area, closer to a window, or outside. If the message persists across multiple locations, contact your carrier to check for an outage or account issue.
Mobile data not working after switching SIM cards?
A new SIM card from a different carrier often requires updated APN settings. On Android, go to Settings > Connections > Mobile Networks > Access Point Names and reset to default or enter the new carrier's APN values manually. On iPhone, inserting a new SIM triggers an automatic carrier settings prompt. Accept the update and restart.
Why isn't my data working when I travel abroad?
Either data roaming is disabled, or your home plan does not include international data. Enable data roaming via Settings > Cellular > Cellular Data Options > Data Roaming on iPhone, or Settings > Network & Internet > SIMs > Roaming on Android. For cost-free international data without roaming charges, activate a Jetpac eSIM for international travel before departure.
Does resetting network settings delete everything on my phone?
Resetting network settings deletes saved Wi-Fi passwords, Bluetooth pairings, and network configurations. It does not delete photos, apps, messages, or any personal data stored on your device. You will need to reconnect to Wi-Fi networks and re-pair Bluetooth devices after the reset.
When should I contact my carrier?
Contact your carrier if none of the fixes above have resolved the issue, if you see No Service or SOS in the status bar across multiple locations, if you suspect a network outage, or if you have recently changed your plan and data has not been activated. Check Downdetector.com first to rule out a wider network outage before calling.
Disclaimer
The settings, paths, and steps described in this guide are based on iOS and Android as of 2026 and are accurate for most current devices. Exact menu names and paths may vary depending on your device manufacturer, model, and software version. Always verify steps against your device's current settings. Jetpac is not responsible for network variations, third-party service changes, or connectivity issues in any destination. Contact your carrier or device manufacturer for device-specific support. No product endorsement is implied or intended.
