Xiaomi SIM Detected But No Signal Available Fix

Xiaomi SIM Detected But No Signal Available – UK Fix

This guide helps if your Xiaomi detects the SIM card (shows carrier name or SIM toolkit apps) but shows "No Signal", "No Service", or "Emergency Calls Only" with no network connection. It covers all UK carriers – EE, O2, Vodafone, Three, Giffgaff, SMARTY, VOXI, Lyca, Lebara, and others.

Quick Answer:
If your Xiaomi detects the SIM but has no signal, first toggle Airplane mode ON for 30 seconds, then OFF. Then go to Settings → SIM cards & mobile networks → [Your carrier] SIM → Network operators → Search networks → Select your carrier manually. If that doesn't work, reinsert your SIM and restart your phone.

Applies to Redmi, POCO and Xiaomi Phones

This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS. If you're on a specific UK carrier, see the related guides at the end of this article.

Check Whether the SIM Is Properly Detected

Before troubleshooting signal issues, confirm your phone can read the SIM card:

  • Carrier name appears – In Settings → SIM cards & mobile networks, you should see your carrier's name.
  • Phone number shown (if available) – Some SIMs store the phone number.
  • SIM Toolkit appears – You should see the SIM Toolkit app in your app drawer.
  • ICCID visible – Settings → About phone → SIM status → ICCID should show a number.

If none of these are visible, the issue is SIM Not Detected, not No Signal. This guide will not help – see the SIM Not Detected guide.

🔍 Quick Diagnostic Table

Use this table to quickly identify what your symptom means:

What you seeWhat it usually means
Carrier name but no barsRegistration failure
Bars appear brieflyCoverage or handover
Emergency Calls OnlyAccount or SIM restriction
No carrier nameSIM detection issue
Unknown IMEIBaseband/modem issue

🔍 Quick Start – Find Your Path

SymptomMost Likely CauseGo To
SIM detected but No SignalNetwork registration failureSection 1
SIM detected but Emergency Calls OnlyAccount or SIM issueSection 2
Signal appears and disappearsCoverage or network switchingSection 3
After a HyperOS updateSettings resetSection 4

Section 1 – SIM Detected but No Signal

If your phone shows the carrier name but has no signal, the SIM is detected but cannot register on the network. One of the most frequent causes of this problem is network registration failure.

Try these in order:

  1. Toggle Airplane mode – ON for 30 seconds, then OFF. This often forces re-registration.
  2. Manual network selection – Settings → SIM cards & mobile networks → [Your carrier] SIM → Network operators → Turn off "Choose automatically" → Search → Select your carrier manually.
  3. Check preferred network type – Settings → SIM cards & mobile networks → [Your carrier] SIM → Preferred network type → Select 5G/4G/3G auto (not "5G only" or "3G only").
  4. Restart your phone – A full reboot can resolve temporary glitches.
  5. Check IMEI – Dial *#06# to display your IMEI number. If it shows "Unknown" or "Null", network registration may not be possible – contact Xiaomi support.

Section 2 – Emergency Calls Only (Account or SIM Issue)

If your phone shows "Emergency Calls Only", it can see the network but cannot register for standard service. This is often an account or SIM issue.

Try these in order:

  1. Check your account status – Call your carrier from another phone. Ask if your account is active and in good standing.
  2. Check SIM balance and plan – Ensure your account is active and that any required PAYG balance, bundle, or plan remains valid.
  3. Test your SIM in another phone – If it also shows Emergency Calls Only, the issue is your SIM or account. Contact your carrier.
  4. Request a new SIM profile – Ask your carrier to send an over-the-air (OTA) SIM refresh.

Section 3 – Signal Appears and Disappears (Coverage or Network Switching)

If signal appears and disappears, the issue is usually coverage or network switching.

Try these in order:

  1. Check carrier coverage – Visit your carrier's coverage map. If coverage is weak, this is expected.
  2. Switch to 4G – Set Preferred network type to 4G/3G/2G auto. 5G can be unstable in some areas.
  3. Enable WiFi Calling – Settings → SIM cards & mobile networks → [Your carrier] SIM → WiFi Calling → ON. This routes calls over WiFi when signal is weak.
  4. Check specific locations – Indoor coverage problems can vary depending on building materials. Steel-framed offices, underground stations, shopping centres, and modern energy-efficient buildings may all reduce signal strength even when outdoor coverage is good. Also consider rural valleys and temporary events/crowds.

Section 4 – After a HyperOS Update

If No Signal appeared after a HyperOS update, the update may have reset network settings.

Try these in order:

  1. Manual network selection – Section 1.
  2. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth (removes saved Wi-Fi passwords).
  3. Check preferred network type – Set to 5G/4G/3G auto.

Dual SIM Considerations

If you're using two SIMs, try these steps:

  • Disable the second SIM temporarily – Settings → SIM cards & mobile networks → Turn off the second SIM.
  • Set the affected SIM as default for mobile data – Settings → SIM cards & mobile networks → Default for mobile data → Select the SIM you're troubleshooting.
  • Swap SIM slots – Power off → move the SIM to the other slot → power on.

eSIM Considerations

If you're using an eSIM and it has no signal:

  • Check if the eSIM profile has expired – Some eSIMs have a limited validity period.
  • Contact your carrier – Ask them to refresh the eSIM profile or send a new QR code.
  • Delete and re-download the carrier profile – Only if your carrier recommends this.

Why Does Xiaomi Detect SIM but Show No Signal?

  • Network registration failure – A common cause. Airplane mode often resolves it.
  • Carrier account issue – Unpaid bill, expired PAYG credit, or suspended service.
  • SIM card issue – Dirty contacts, loose fit, or faulty SIM.
  • Network outage – Temporary carrier issue in your area.
  • Temporary mast maintenance – Carriers may perform maintenance at specific times.
  • Roaming disabled while abroad – Check that data roaming is enabled.
  • Expired eSIM profile – Some eSIMs have a validity period.
  • Carrier provisioning delay – New SIMs may take time to activate.
  • Dual SIM conflict – Both SIMs may be trying to register simultaneously.
  • Unsupported frequency bands – Rare on imported models.

⚠️ What NOT to Do

  • Don't factory reset your phone – This is rarely needed for No Signal issues.
  • Don't assume your phone is broken – Test your SIM in another phone first.
  • Don't ignore your account status – Check with your carrier before troubleshooting.

Quick Questions

Why does my Xiaomi detect the SIM but have no signal?
Most commonly network registration failure. Toggle Airplane mode or manually select your carrier.

Why does my Xiaomi show the carrier name but no bars?
The phone can read the SIM but cannot register on the network. Try manual network selection first.

Why does my Xiaomi detect the SIM but say "Not Registered on Network"?
The SIM is recognised, but the phone cannot complete network registration. This is usually caused by a carrier account issue, incorrect network settings, or temporary registration failure.

Can a damaged SIM still be detected?
Yes. A damaged SIM may still be readable but fail network registration. Test your SIM in another phone.

Why does my phone only get signal outdoors?
This is a coverage issue. Indoor signal can be weaker due to building materials. Try WiFi Calling indoors.

Can a software update cause No Signal?
Yes. HyperOS updates can reset network settings. Check preferred network type and APN settings.

Why does my SIM work in another phone but not mine?
This indicates a phone-specific issue. Try resetting network settings or checking IMEI.

Will resetting network settings fix No Signal?
It can help if settings are corrupted. Try Airplane mode and manual selection first.

How do I check my IMEI number?
Dial *#06# to display your IMEI. If it shows "Unknown" or "Null", contact Xiaomi support.

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