In this guide

Check Control Centre
Check Mobile networks
Check Data roaming abroad
Open the SIM's settings
Check the APN
Open Data usage
See which apps use data
If you do not see this option
If this does not work
Good to know
Sources

Short answer

Check the Mobile data tile in Control Centre, then Settings, Mobile networks, Mobile data. Open the SIM and check Access point names, and check Data roaming if you are abroad. Settings search, Data usage, shows which apps used data.

Device: Android
Shown on: Xiaomi Redmi Note 15 Pro 5G (25080RABDG), HyperOS 3.0.308.0, Android 16
App: Settings
Path: Settings › Mobile networks
Real screenshots: 7 of 7 steps
Checked: October 2026
Sources: 1 official, linked below

Step by step

Check Control Centre
Swipe down from the top right. The Mobile data tile should say On.
Done
Check Mobile networks
Go to Settings, Mobile networks. Mobile data should be on. Our SIM is in slot 1.
Done
Check Data roaming abroad
Data roaming, on the same page, connects to data services when roaming. It needs to be on abroad.
Done
Open the SIM's settings
Tap the SIM at the top. Tap Access point names.
Done
Check the APN
The APN list should show your carrier's entry; ours had one under General. New APN and Reset are at the bottom; we did not change anything here.
Done
Open Data usage
Search Settings for Data usage. Ours first asked to Send app and network usage and diagnostic data. You can tap Disagree; we did.
Done
See which apps use data
The list shows each app's mobile data for today. Ours read 0 B, as we were on Wi-Fi.
Done

If you do not see this option

Only one SIM slot listed as No SIM card? That is slot 2 when you have one SIM. Turn on eSIM, on the same page, says eSIM will replace SIM 2.
Two SIMs? Xiaomi says to choose the data SIM in Mobile networks. Source: Generic User Guide for HyperOS 3.0

If this does not work

Data off after a restart? Check both switches again: the Control Centre tile and Mobile data in Settings. Source: Generic User Guide for HyperOS 3.0
Still no data? Reset Wi-Fi, mobile networks and Bluetooth resets network settings: Wi-Fi keeps disconnecting.

About this guide

Mobile data on HyperOS has a switch in Control Centre and another in Settings. The SIM's own settings hold the APN and network type.

The screenshots are from our Redmi Note 15 Pro 5G with Xiaomi HyperOS 3.0.308.0 and Android 16, in Light mode. We only opened these screens and changed nothing. Our carrier and number are blurred.