Mobile Data Not Working on Android? Fix 4G and 5G

Start with the simplest reversible checks before moving to resets or repair.

Why this happens

Do not assume the most expensive failure first. This problem usually becomes much easier once you separate a settings problem from a connection, app, accessory or hardware problem.

• There may be no usable carrier signal in the current location.
• Mobile data can be disabled even while calls and SMS still work.
• On dual-SIM phones, the wrong SIM may be selected for data.
• A carrier account, plan, data cap or outage can block internet access.
• APN or network configuration can be wrong after a SIM change or carrier update.

Fix it in this order

1. Turn Wi‑Fi off and test a webpage using mobile data only.
2. Make sure Mobile data is enabled in Network & internet/Connections.
3. Turn Airplane mode on for about 15 seconds, then turn it off and wait for the phone to reconnect.
4. Restart the phone.
5. On dual-SIM devices, verify the correct SIM is selected for mobile data.
6. Check whether a data limit, Data Saver rule or exhausted prepaid balance is involved.
7. Move to an area with stronger coverage and test again.
8. If calls/texts work but data still fails, contact the carrier before manually entering APN settings.

How to identify the real cause

No signal bars or an emergency/SOS indicator points toward coverage, SIM or carrier registration. Good signal with no internet points more toward data settings, plan status, APN or a network outage.

Common mistakes that waste time

• Changing APN values from random websites before checking the carrier.
• Assuming 5G is required; LTE can provide normal data service.
• Resetting all network settings before checking whether the carrier account has active data.
• Testing mobile data while the phone remains connected to Wi‑Fi.

Why the troubleshooting order matters

Good troubleshooting changes one variable at a time. Start with the checks that are fast, reversible and low risk. If the problem disappears after one change, stop there and verify it for a while instead of continuing to reset unrelated settings.

Also pay attention to scope. A problem affecting one app or one accessory usually deserves app/accessory troubleshooting. A problem affecting everything on the device points more toward a system setting, network, driver or hardware issue.

When this is probably not a settings problem

Contact the carrier if the account is active but data fails in multiple locations, especially if another phone with the same carrier works. Contact the phone maker if multiple known-good SIMs fail in the same device.

If you need repair or manufacturer support, write down what you already tested. A short list of known-good cables, devices, networks or apps you tried is much more useful than saying only that the feature “doesn't work.”

Use another SIM or another phone when possible

The fastest way to separate phone and carrier problems is a cross-test. Put the SIM in another compatible phone, or put another working SIM in your phone. Do this only if your carrier/eSIM setup allows it safely. The result quickly shows whether the failure follows the account/SIM or stays with the handset.

Do not chase the 5G icon

A phone does not need 5G to have working internet. LTE/4G can provide full service. If forcing 5G or changing preferred network types makes the connection less stable, return to the carrier-recommended automatic mode.