Quick Answer: If your POCO X7 Pro is suddenly losing mobile data, showing no signal, refusing to register on a UK network, or experiencing problems after a HyperOS update, you are not necessarily dealing with a faulty phone. The cause can be a temporary carrier problem, SIM or network-registration issue, incorrect mobile-network settings, or a software-related problem.

The first step is to identify which symptom you are experiencing:

  • Mobile data not working while you still have signal → APN or data settings
  • No signal / Emergency calls only → Network registration, SIM status, or carrier
  • Issue started after a HyperOS update → Check for a new patch
  • SIM not detected → SIM reinsert or carrier replacement

Why This Happens

  • Network registration failure: The POCO X7 Pro may fail to authenticate with the UK carrier's network, especially after a HyperOS update.
  • Carrier-side outage or maintenance: Temporary service disruptions on UK networks can cause connectivity loss.
  • SIM card detection error: The device may not read the SIM properly due to dust, improper insertion, or a faulty SIM slot.
  • Software or modem configuration issue: A HyperOS update can sometimes coincide with changes to network settings or connectivity behaviour. Installing the latest patch may resolve related issues.

Check Network Status (UK Carrier)

Before troubleshooting your POCO X7 Pro, verify if your UK carrier is experiencing issues:

  • Check your carrier's official status page (e.g., EE, O2, Vodafone, Three).
  • Check Downdetector UK for live user-reported outage patterns as a secondary indicator.
  • Test with another device on the same network to confirm if the issue is device-specific.

UK networks covered: EE • O2 • Vodafone • Three • giffgaff • Lebara • Lyca Mobile • SMARTY

Identify Your Symptom

Choose the symptom that matches your current issue:

📱 Mobile data not working (signal bars are present)

Go to APN Configuration Check and Mobile Data Settings below.

📶 No signal / Emergency calls only

Go to SIM / Network Reset Actions and Contact Carrier below.

📉 Network keeps dropping or switching between 5G/4G

Go to Network Settings and HyperOS Update Check below.

⚠️ SIM card not detected

Go to SIM / Network Reset Actions (reinsert + slot switch) below.

📞 Calls not connecting / VoLTE not working

Go to Contact Carrier below (provisioning issue).

Check Mobile Data / Network Settings

Navigate on your POCO X7 Pro:

Settings → SIM cards & mobile networks → Select your active SIM.

  • Ensure Mobile data is toggled ON.
  • Verify Preferred network type is set to 5G/4G/3G/2G (Auto).
  • Keep Data roaming off when using a UK SIM in the UK. If you're abroad, follow your carrier's roaming requirements.

APN Configuration Check (for Mobile Data Issues)

Note: Incorrect APN settings affect mobile data only. They do not cause signal loss, call failures, or SIM detection errors.

To verify APN settings:

  1. Go to Settings → SIM cards & mobile networks → Select your SIM → Access Point Names.
  2. Select the APN provided by your carrier (e.g., "giffgaff.com", "three.co.uk").
  3. Tap Reset to default if available.
  4. If the issue persists, create a new APN using the exact settings from your carrier's official support page.

SIM / Network Reset Actions

Perform these quick resets in order:

  1. Toggle Airplane Mode: Enable Airplane mode for 15 seconds, then disable it.
  2. Restart the POCO X7 Pro: Press and hold the power button, select Restart.
  3. Reinsert SIM Card: Power off the device, remove the SIM tray, inspect the SIM for dirt or damage, reinsert firmly.
  4. Switch SIM Slot (diagnostic only): If using dual SIM, temporarily test the SIM in the other supported slot to rule out a hardware fault.

HyperOS / System Update Check

Go to Settings → About phone → System updates.

  • Check for any pending HyperOS updates.
  • Installing an available HyperOS update may resolve software-related connectivity problems.
  • Some network settings may reset after major system updates. Review your mobile data and APN settings after updating.

Reset Network Settings (Last Resort)

Important: This does not erase your photos, apps, or personal files. It removes saved Wi-Fi networks, Bluetooth devices, and mobile-network settings.

Navigate to:

Settings → Connection & sharing → Reset Wi-Fi, mobile & Bluetooth → Reset settings.

Confirm the action. After the reset, reconnect to Wi-Fi and test mobile data.

Contact Carrier (When Required)

Contact your UK carrier support if:

  • VoLTE or WiFi Calling is not provisioning on your POCO X7 Pro.
  • eSIM activation fails during setup.
  • Network registration errors persist after all resets.
  • Your carrier reports that your account requires a network refresh on their end.
  • Ask the carrier to check whether your SIM/account is correctly provisioned for 4G/5G, VoLTE and other required network services.

Final Verdict

Mobile data problems on the POCO X7 Pro can be caused by incorrect APN settings, mobile-network configuration issues, or temporary network-registration problems. For signal or call issues, the problem is more likely related to carrier coverage, SIM registration, or network mode selection. If the issue started after a HyperOS update, check for a new patch first. When device-level steps do not resolve the problem, contact your UK carrier to verify account provisioning and network access.

Diagnostic Summary

Symptom Primary Action
Mobile data not working (signal OK) APN settings → Mobile data toggle → Network reset
No signal / Emergency calls only Carrier status → Network mode → SIM reinsert → Carrier contact
Issue started after HyperOS update Check for new update → Network settings reset
SIM not detected SIM reinsert → Switch SIM slot → Carrier (SIM replacement)
VoLTE / WiFi Calling not working Carrier provisioning check → Network settings reset

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