Xiaomi Calls Keep Dropping on UK Networks in Brighton (2026 Fix)

If your Xiaomi, Redmi or POCO phone drops calls, cuts out during conversations, or fails to maintain a stable connection while you're in Brighton, this guide covers the most common fixes. Dropped calls can happen even with full signal bars—signal strength doesn't always guarantee reliable calling.

Key Understanding

Call stability depends on more than signal bars. For a call to stay connected, your phone needs VoLTE enabled, correct IMS registration, and a stable network handover. If any of these fail, calls can drop even with full signal.

Before You Start – Quick Checks

Toggle Airplane Mode – Turn on for 30 seconds, then off to refresh network registration.
Restart your phone – Clears temporary software glitches affecting call stability.
Check for local network issues – Use your carrier's service status page. If neighbours on the same network have the same problem, the issue may be network-wide.
Try a call on WiFi – Enable WiFi Calling in Settings → SIM cards & mobile networks → Your SIM → WiFi Calling. If calls work on WiFi, the issue is likely mobile signal-related.
Check your carrier's coverage – Use your carrier's coverage checker.

If these quick checks don't work, continue with the step-by-step guide below.

Diagnose the Issue First

Before making changes, use this quick diagnostic flow:

Quick Diagnostic Flow

Do calls drop indoors but work outside? → Likely weak indoor coverage. Try WiFi Calling or move to a different room.
Do calls drop only in certain parts of Brighton? → Likely local coverage gaps or congestion.
Do calls drop when switching between 4G and 5G? → Try switching to 4G preferred to avoid unstable handover.
Do calls work on WiFi Calling but drop on mobile? → The issue is mobile signal or VoLTE-related—check VoLTE, IMS registration, and preferred network type.
Did the problem start after a HyperOS update? → Settings or carrier profiles may have been reset.
Test the same SIM in another phone – This is the single most valuable diagnostic step. If calls work on the other phone, the issue is your Xiaomi. If they also drop, the issue is your carrier or SIM.

Why Calls Drop on UK Networks

VoLTE not enabled or provisioned – Since the UK's 3G switch-off, compatible 4G/5G devices generally rely on VoLTE or VoNR for voice calls. If VoLTE is disabled or not provisioned on your account, calls may fail or drop.
IMS registration failure – IMS (IP Multimedia Subsystem) registration is required for VoLTE and VoWiFi to work. If IMS shows "Not Registered", calls won't route properly.
5G handover instability – In some areas, switching between 5G and 4G can cause calls to drop. Switching to 4G preferred often improves stability.
Weak indoor coverage – Building materials, tunnels, and distance from masts can weaken signal indoors.
Carrier provisioning or account issues – VoLTE or WiFi Calling may not be enabled on your account or plan.
Network congestion or local mast issues – Urban areas like Brighton experience congestion during peak hours. Local mast work or signal gaps can also cause problems.
HyperOS power management – Less commonly, battery optimisation can restrict the Phone app, potentially affecting call stability.

Brighton-Specific Notes

Brighton Network Context

Local coverage variation – Like many UK cities, coverage and network load can vary between different parts of Brighton. Indoor coverage, especially in older buildings or basement flats, can be less reliable.
Location-based diagnosis – If calls drop consistently in one specific location but work normally elsewhere, treat it as a local coverage or network-condition issue rather than a phone fault. Check your carrier's service status and consider WiFi Calling in that area.

Step-by-Step Fixes

Step 1: Check and Enable VoLTE

Why this matters: Since the UK's 3G switch-off, compatible 4G/5G devices generally rely on VoLTE or VoNR for voice calls. If VoLTE is disabled or not provisioned, calls may drop or fail entirely.

Settings → SIM cards & mobile networks
Tap your SIM
Look for "Use VoLTE" or "4G Calling"
Ensure it's toggled ON
If VoLTE is missing, check carrier provisioning first. Contact your carrier to verify VoLTE is enabled on your account or SIM profile before using diagnostic codes.
If your carrier confirms that VoLTE is supported and provisioned but the VoLTE option is still unavailable, some Xiaomi models support the *#*#86583#*#* diagnostic code to change the carrier-check state. The code does not enable VoLTE service if your carrier or device does not support it.

Carrier support numbers: EE: 150 | O2: 202 | Vodafone: 191 | Three: 333

If VoLTE is on but calls still drop, move to Step 2.

Step 2: Enable WiFi Calling

Why this matters: When properly provisioned, WiFi Calling routes calls over your broadband, which can help when mobile signal is weak indoors.

Settings → SIM cards & mobile networks
Tap your SIM
Look for "WiFi Calling" or "Use WiFi Calling"
Toggle it ON
If WiFi Calling is missing, your carrier may not support it on your handset model, software version, or account. Contact your carrier to check.

Test: Turn on Airplane Mode, enable WiFi only, and make a call. If the call connects, WiFi Calling is working.

If WiFi Calling isn't available or doesn't help, move to Step 3.

Step 3: Switch to 4G Preferred

Why this matters: 5G handover can be unstable in some areas, causing calls to drop when switching between 4G and 5G.

Settings → SIM cards & mobile networks
Tap your SIM
Tap Preferred network type
Select 4G/3G/2G auto or 4G (LTE) preferred
If your device has a 5G-only option, avoid using it
Test a call after switching

Brighton diagnostic tip: If calls become stable after switching to 4G preferred, this is a useful sign that the problem may be related to 5G coverage or handover rather than the phone's basic calling function.

If calls still drop, move to Step 4.

Step 4: Check IMS Registration

Why this matters: IMS registration is required for VoLTE and VoWiFi to work. If IMS shows "Not Registered", calls will drop or fail.

Open the Phone app
Dial *#*#4636#*#*
Tap Phone information
Look for "VoLTE provisioned" – if available, this indicates that VoLTE provisioning is enabled on the device.
Look for "IMS registered" – if available, this shows whether the device is currently registered with the IMS service.
If IMS is not registered, reset network settings or contact your carrier

Note: Depending on your Xiaomi model and HyperOS version, some IMS fields may not be available in this menu.

If IMS is registered but calls still drop, move to Step 5.

Step 5: Remove Battery Restrictions on Phone App

Why this matters: Less commonly, HyperOS power management can restrict the Phone app, potentially affecting call stability. This is worth ruling out if the problem started after a software update or aggressive battery-saving configuration.

Settings → Apps → Manage apps
Find Phone or Dialer app
Tap Battery saver or Restrict background activity
Set to No restrictions or Automatic (not "Restrict")
Settings → Battery → Battery saver – set to Balanced or Performance mode
Test a call after making these changes

If calls still drop, move to Step 6.

Step 6: Reset Network Settings

Why this matters: This resets Wi-Fi, mobile data, and Bluetooth settings without deleting personal data. It can clear incorrect or corrupted network configurations that may be affecting call stability.

Settings → Connection & sharing (HyperOS) or Settings → Additional settings → Backup & reset (MIUI)
Select Reset Wi-Fi, mobile & Bluetooth or Reset network settings
Confirm the reset
Restart your phone
Allow it to reconnect to the mobile network, then test a call

Note: Resetting network settings will clear saved Wi-Fi passwords and Bluetooth devices, but will not delete photos or personal data.

If resetting network settings doesn't work, move to Step 7.

Step 7: Check for HyperOS Updates

Why this matters: Xiaomi software updates can include modem, network or carrier-related fixes, so checking for the latest available build is worthwhile.

Settings → About phone → Check for updates
Install any available updates
Restart your phone and test a call

If you're already on the latest version and calls still drop, move to Step 8.

Step 8: Test SIM in Another Phone

Why this matters: This is the single most valuable diagnostic step. It separates device issues from network/SIM/carrier issues quickly.

Insert your SIM into another phone
Test calls on the other phone in the same location
If calls work on the other phone → The issue is with your Xiaomi device – continue troubleshooting or contact Xiaomi support
If calls also drop on the other phone → The issue is with your SIM or carrier – contact your carrier
If possible, test a different SIM in your Xiaomi
If another SIM works normally, the issue may be with your account or carrier profile

Contact Carrier (When Required)

Contact your carrier if:

VoLTE or WiFi Calling are not provisioned on your account
You've tried all steps above and calls still drop
You have an older SIM card that may lack VoLTE profiles
There's a known network issue in Brighton
You need to check if your specific Xiaomi model is supported for VoLTE or WiFi Calling
Your SIM also drops calls in another phone (indicating a carrier/network issue)

Carrier Support Contacts

EE – Call 150 | Text VOLTE to 150 to check provisioning
O2 – Call 202 | o2.co.uk/help
Vodafone – Call 191 | vodafone.co.uk/help
Three UK – Call 333 | three.co.uk/support
Coverage checker and service status – Use your carrier's network status page to check for local issues before resetting your phone

Contact Xiaomi UK Support if:

Calls drop on your Xiaomi but work normally in another phone with the same SIM
You've tried all steps above and calls still drop
The issue persists with multiple carrier SIMs in your Xiaomi
You suspect a hardware fault with the cellular antenna or modem

Xiaomi UK Support

Xiaomi UK Support Portal: mi.com/uk/support/
Send feedback: Settings → Services & feedback

Final Verdict – Decision Tree

Use this decision tree to determine the most likely cause and next action:

Calls drop indoors but work outside → Enable WiFi Calling, switch to 4G preferred, or move to a different room.
Calls drop only in one part of Brighton → Likely local coverage gap or mast issue. Check your carrier's service status and report the problem.
Calls drop when switching between 4G and 5G → Switch to 4G preferred to avoid unstable handover.
VoLTE toggle is missing or greyed out → Contact your carrier to check VoLTE provisioning. If provisioned but still missing, try the diagnostic code as a workaround on some models.
WiFi Calling works but mobile calls drop → The issue is mobile signal or VoLTE-related—check VoLTE, IMS registration, and preferred network type.
Calls drop after a HyperOS update → Check VoLTE and IMS settings, then check for further updates.
SIM works in another phone but drops calls in your Xiaomi → The issue is with your Xiaomi device – check battery restrictions, network settings, and update.
SIM also drops calls in another phone → The issue is with your carrier or network – contact your carrier.

Frequently Asked Questions

Why do my Xiaomi calls keep dropping in Brighton?

Common causes include: VoLTE not enabled or provisioned, 5G handover instability, weak indoor coverage, network congestion, or carrier provisioning issues. Coverage and network load can vary between different parts of Brighton.

How do I enable VoLTE on my Xiaomi in the UK?

Go to Settings → SIM cards & mobile networks → Tap your SIM → Toggle "Use VoLTE" or "4G Calling" ON. If the toggle is missing, check carrier provisioning first. If provisioned but missing, try dialling *#*#86583#*#*, restart, and check again.

Does WiFi Calling fix call drops in Brighton?

Yes. When properly provisioned, WiFi Calling routes calls over your broadband, which can help when mobile signal is weak indoors. This is often the most effective fix for indoor call drops.

Should I use 4G or 5G for calls?

In some areas, 5G handover can be unstable. Switching to 4G preferred often provides more stable calls. If calls become stable after switching to 4G preferred, this suggests the problem may be related to 5G coverage or handover.

Can HyperOS updates cause call drops?

Some early HyperOS builds introduced call instability on specific Xiaomi and Redmi models. Minor updates frequently patch modem behaviour and call stability issues—checking for the latest available build is worthwhile.

Does network congestion cause call drops?

Yes. Urban areas like Brighton experience congestion during peak hours. Neighbours on the same network having the same issue is a sign of a network-wide problem.

Why do calls drop indoors but work outside?

Building materials like thick walls, metal structures, and energy-efficient glass can block mobile signal indoors. Enable WiFi Calling or move to a different room.

Will resetting network settings fix call drops?

It can help if network settings or carrier profiles were corrupted. However, WiFi Calling and VoLTE are usually more effective for call drops.

What should I do if calls drop only in certain parts of Brighton?

Check your carrier's service status page. If there's no reported outage, report the problem to your carrier. In the meantime, use WiFi Calling when in affected areas.

How can I tell if the problem is my Xiaomi or my carrier?

Test your SIM in another phone. If calls work on the other phone, the issue is with your Xiaomi. If calls also drop on the other phone, the issue is with your carrier or network.

Note: This guide is updated for 2026. Menu names may vary slightly between HyperOS and MIUI versions. With the UK's 3G switch-off, VoLTE and WiFi Calling are essential for reliable voice calls.

Xiaomi Calls Keep Dropping on UK Networks in Brighton