Technician helping troubleshoot Xiaomi phone calls dropping randomly

Steve H.

Reviewed for technical accuracy

Specialities: Xiaomi call quality issues (calls dropping, disconnecting mid-call, weak signal), network settings (2G/3G/4G/5G), SIM card and cellular diagnostics

Xiaomi random call drops, disconnections mid-call, weak cellular signal — safe checks (network, SIM, settings) before you change anything

Technician avatar Technician
I hear you. When a Xiaomi phone keeps dropping calls, it feels like the phone isn’t reliable anymore — and that’s stressful when you depend on calls for work or family.

Trust moment: let’s not panic or assume the phone is broken. Most call drops come from network, SIM, or settings, and we can check those safely first.

Quick start: when the calls drop, do you see no signal bars, or do the bars stay but the call just cuts out?
Customer
The bars are usually there, but sometimes they flicker. The call just ends. Sometimes I get a “Network error” message, sometimes it’s just silent and the call is gone.
Technician avatar Technician
That’s very helpful. Bars that flicker and a “Network error” message usually point to either signal quality (not strength) or network mode switching (the phone jumping between 4G and 3G, for example).

A few quick questions: do the drops happen in the same location (like at home or at work), or everywhere? And does it happen on calls to specific people, or any call?
Customer
It happens mostly at home and at work. Not just one person. Sometimes I can make a call fine, other times it drops within a minute. It’s random.
Technician avatar Technician
That pattern — random drops at multiple locations — usually rules out a single weak tower. It suggests the phone is having trouble staying connected to the network mode it’s using, or the SIM isn’t being read cleanly.

Trust moment: I don’t want you changing deep network settings or disabling features without understanding why. We’ll check the safe, reversible things first.

Let me ask: have you noticed if the drops happen more on Wi-Fi calling (when you’re on home Wi-Fi) or on cellular (using the SIM card)? Or both equally?
Customer
Mostly cellular. I don’t use Wi-Fi calling much. And I haven’t changed anything on the phone recently — it just started a few weeks ago.
Technician avatar Technician
That’s a clue. When call drops start suddenly without any change you made, it usually means one of these:
• The SIM card is getting loose or dirty (especially if the phone has been moved around or the SIM slot is exposed).
• Network mode switching (the phone flipping between 4G and 3G too often).
• A carrier network issue (your carrier updated towers or settings, and the phone isn’t adapting well).
• Rarely, a hardware issue with the antenna or SIM slot.

The safest first check: have you removed the SIM card and looked at it?
Customer
No, I haven’t. I’m not sure if I should. What if I damage something?
Technician avatar Technician
It’s very safe — you won’t damage anything. Xiaomi phones have a small SIM tray that pops out with a tiny pin or tool (sometimes included in the box). The SIM card itself is tough.

Here’s the gentle way to check: power off the phone first, then use the SIM ejector tool (or a small paperclip) to gently pop the tray. Look at the SIM card — is it clean and flat, or does it look bent, scratched, or dusty? Any visible damage means it might need replacing, but most of the time a gentle clean with a soft cloth helps.
Customer
Okay, I’ll try that. But what if the SIM looks fine? What’s the next thing to check?
Technician avatar Technician
Good question. If the SIM looks fine after you clean it gently and reinsert it, the next safe check is network mode. Xiaomi phones let you choose which cellular modes to allow (2G, 3G, 4G, 5G).

Sometimes the phone gets stuck switching between modes too fast, and that causes drops. A common fix is to lock the phone to a single stable mode — like 4G only — and see if calls stay connected for a few days.

Does your area have good 4G coverage? Or are you in a place where 3G is more common?
Customer
I think it’s mostly 4G where I am, but I’m not 100% sure. How do I check which mode the phone is using right now?
Technician avatar Technician
Easy. Look at the top of your screen — next to the signal bars, you should see a small letter like 4G, LTE, 3G, or H+. That tells you what mode it’s using right now.

Trust moment: I don’t want you diving into hidden menus or typing secret codes. We can check and adjust the network mode safely through normal Settings.

What does your status bar show right now?
Customer
It says 4G. But sometimes I see it change to 3G or H+, then back to 4G. That happens pretty fast.
Technician avatar Technician
That fast switching is very likely the cause of your call drops. When the phone jumps from 4G to 3G mid-call, the call often breaks because the connection changes too quickly.

A safe test: go to Settings > SIM cards and mobile networks > Network mode (the exact path varies by Xiaomi model, but it’s always in SIM settings). Look for an option like “Preferred network type” or “Select network mode.”

If you see a choice that says 4G only or LTE only, try selecting that for a few days and see if calls stay connected. If there’s no “4G only” option, you might see 4G/3G/2G — leave it as is for now.

Does that settings path sound familiar?
Customer
I’ll look for it. But I’m worried — what if I pick the wrong thing and break the cellular connection completely?
Technician avatar Technician
That won’t happen. Network mode choices are all safe — you can change them back anytime. If you pick “4G only” and it doesn’t help, or if you lose signal, just go back and pick “Auto” or the previous setting. Nothing gets broken.

The worst that happens is the call quality doesn’t improve, and you know to try something else.

Once you’ve checked the SIM and tested the network mode, if calls are still dropping, the next step would be to contact your carrier (they can check if your SIM is registered correctly on their network, or if there’s a known issue in your area). They might also offer to send you a replacement SIM for free.
Customer
That makes sense. So I check the SIM first, then try locking it to 4G, and if that doesn’t work, I call the carrier. What if it’s actually a hardware problem?
Technician avatar Technician
Hardware issues are rare, but they do happen. If the SIM is clean, the network mode is stable, and your carrier confirms the SIM is registered correctly — and calls still drop — then it could be the antenna or SIM slot.

At that point, Xiaomi warranty service or a local phone repair shop can test the hardware. But I’d be surprised if you get there — most random call drops are SIM or network mode related, and those are fixable at home.

A final safe check before you try anything: are there any apps running in the background that might interfere with calls (like VPN apps, call recording apps, or very old apps)? Sometimes those can cause drops too.
Customer
I have a few apps, but nothing unusual. I think I’ll start with the SIM check and the network mode. This has been really helpful — I feel less scared to try these things now.

Quick answer: the accepted fix

Accepted first fix for Xiaomi phone calls dropping randomly (safe approach): 1) power off the phone and gently remove the SIM card using the ejector tool, inspect it for dirt or damage, clean it with a soft cloth, and reinsert it, 2) check the status bar to see if the network mode (4G, 3G, H+) is switching rapidly mid-call, 3) if mode switching is visible, go to Settings > SIM cards and mobile networks > Network mode and try locking to 4G only for a few days to test stability, and 4) if drops continue after the SIM check and mode lock, contact your carrier to confirm the SIM is registered correctly and ask about known network issues in your area or a replacement SIM. Hardware issues are rare and usually only suspected after network and SIM checks rule out other causes.

Why Xiaomi calls drop randomly (and why it usually starts suddenly)

When a Xiaomi phone starts dropping calls randomly, the phone itself is usually not “broken” — the issue is almost always in the connection path between your phone and the network. The most common causes are a loose or dirty SIM card, the phone rapidly switching between network modes (4G to 3G and back), or occasionally a carrier network change that affects your area. If the drops started suddenly without any change you made, it’s rarely a hardware defect right away — it’s more likely the SIM card has shifted slightly, or the phone’s network mode settings need adjustment. A flickering signal bar and a “Network error” message are strong signs that the problem is network-related, not a broken antenna.

What to check first (safe checks before contacting the carrier or seeking repair)

Start with the least risky step: power off the phone, use the SIM ejector tool to remove the SIM card, and inspect it for dust, scratches, or bending. A gentle wipe with a soft, dry cloth and reinsertion often fixes intermittent drops caused by a loose contact. Next, check your status bar regularly during calls to see if the network mode (4G, 3G, H+, LTE) is switching rapidly — if it is, that’s a strong clue. If mode switching is happening, try locking the phone to a single mode (usually 4G) through Settings to see if calls stabilize over a few days. If the SIM looks fine and mode locking doesn’t help, contact your carrier to confirm the SIM is properly registered and ask about any known issues in your coverage area.

Xiaomi random call drops explained — calm, senior-friendly guidance

Focus on the SIM card and network mode first — most call drops come from there.

If your Xiaomi phone keeps dropping calls, don’t assume it’s broken. The SIM card is the first thing to check — it’s tough and safe to handle, and a loose or dirty SIM causes most random drops. Next, watch your status bar during calls to see if the network mode is flickering between 4G and 3G — if it is, locking to one mode often fixes it. These two checks rule out the most common causes and help you avoid unnecessary repair costs. If both checks don’t help, your carrier can investigate whether the SIM is registered correctly or if there’s a network issue in your area.

Disclaimer: This information is AI-generated and intended for general guidance only. Avoid forcing the SIM tray or changing network settings without understanding the options. For model-specific menus and carrier-specific network modes, consult your Xiaomi manual or contact your carrier directly.

If the issue continues

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If Xiaomi calls keep dropping, start with the safest checks: inspect and clean the SIM card, watch for rapid network mode switching, and try locking to 4G. These steps fix most random call drops without any risk.

Expert will respond in minutes

Most random call drops on Xiaomi phones come down to three things: SIM card contact, network mode switching, or carrier registration. These are all fixable from home without special tools.

Stop call disconnections

Once the SIM is clean and the network mode is stable, calls usually stay connected reliably. A carrier SIM replacement is free if needed and often resolves persistent drops.

FAQ

Why does my Xiaomi phone drop calls even though the signal bars are showing?

Signal bars show strength, not quality. Your phone might have a strong signal but be unable to maintain the connection if the SIM card is loose, the network mode is switching too fast, or the carrier network in your area is having issues. A flickering bar during calls is a sign the connection is unstable, even if bars are visible most of the time.

Is it safe to remove the SIM card from my Xiaomi phone?

Yes, it’s very safe. Use the SIM ejector tool (usually included with the phone) or a small paperclip to gently pop out the SIM tray. The SIM card itself is durable and won’t be damaged by handling. Power off the phone first to be extra cautious, then inspect the card for dust or damage and clean it gently with a soft cloth before reinserting.

What does it mean if my network mode keeps switching between 4G and 3G?

It means the phone is moving between coverage areas or the network is struggling to keep it on 4G. If this switching happens during calls, it often causes the call to drop because the connection type changes mid-call. Locking the phone to “4G only” in network settings can prevent this switching and improve call stability if 4G is available in your area.

Can a dirty SIM card really cause random call drops?

Yes, absolutely. Even a small amount of dust or a slight shift in the SIM card’s position in the slot can interrupt the electrical contact between the card and the phone, causing intermittent connection loss. This often results in random call drops that seem to happen for no reason. A gentle cleaning and firm reinsertion usually fix this issue.

Sources

Filed under: Mobile Call Issues

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