Samsung Galaxy mobile data not working? 7 fixes

By Saadat Rafiq · 2 min read · 7 steps · Updated 5 October 2026

Device

Android

Shown on

Samsung Galaxy A57 5G (SM-A576B), One UI 8.5, Android 16

App

Settings

Real screenshots

5 of 7 steps

Checked

October 2026

Sources

1 official, linked below

When Wi-Fi works but mobile data does not, the cause is usually a switch, a data limit or a network setting rather than a broken phone. Work through these in order.

The screenshots are from a Samsung Galaxy A57 5G with One UI 8.5 and Android 16. Other Galaxy phones on One UI 8 use the same menus; on older One UI versions a few names and positions differ.

Step by step

1. Check Mobile data in the quick panel

   Swipe down from the top of the screen and check that Mobile data is on. While you are there, make sure Airplane mode is off.

   Done

2. 

   Open Connections

   Open Settings and tap Connections.

   Done

3. 

   Check Airplane mode

   Airplane mode must be off, or the phone has no mobile connection at all.

   Done

4. 

   Check the Mobile data switch and limits

   Tap Data usage. The Mobile data switch must be on. Data saver and Billing cycle and data warning, on the same page, show whether you have limited data use.

   Done

5. 

   Abroad? Check Data roaming

   Back in Connections, tap Mobile networks. Outside your home country, mobile data only works with Data roaming switched on. Roaming can cost extra; check your tariff first.

   Done

6. Restart the phone

   Hold the Side key and the Volume down key together, tap Power off, wait a moment and switch the phone on again. A restart re-registers the phone on the network.

   Done

7. 

   Reset mobile network settings

   Open Settings, General management, Reset and tap Reset mobile network settings. It restores the mobile network options to their defaults; apps and files stay. On the confirmation screen tap Reset settings.

   Done

Good to know

Older Samsung pages call this option Reset network settings. On One UI 8.5 it is split into Reset mobile network settings and Reset Wi-Fi and Bluetooth settings.

If none of this works, the problem may be coverage, your plan or the SIM: contact your carrier.

Battery worries after turning things off and on: Samsung Galaxy battery draining fast? 6 fixes.

In short: Quick panel: Mobile data on, Airplane mode off. Settings, Connections, Data usage and Mobile networks (roaming). Restart. General management, Reset, Reset mobile network settings. Then your carrier.