You're on a call… and suddenly your internet stops working. No WhatsApp, no browsing, nothing. Annoying, right?
If your mobile data disappears every time you receive or make a call, you're not imagining it. This is a real issue — and in most cases, it’s fixable in minutes.
Let’s get straight to it.
Quick Fix (Try This First)
- Turn on VoLTE (Voice over LTE) in your mobile settings
- Switch network mode to 4G/5G (avoid 2G/3G fallback)
- Restart your phone (this usually fixes it instantly)
- Toggle Airplane mode ON → OFF
- Reinsert your SIM card
Why This Happens
This issue usually comes down to how your network handles calls and data at the same time.
Here’s the simple version:
- Older networks (2G/3G) can’t handle voice + data simultaneously
- Your phone temporarily switches networks during calls
- When that happens, mobile data gets paused
This usually happens after updates or when network settings reset without you noticing.
Most people don’t realize their phone silently drops from 4G to 3G during calls — that’s the moment your internet disappears.
This is where things get tricky: even if you have 4G or 5G enabled, one wrong setting can force your phone to downgrade during calls.
Step-by-Step Fixes
Enable VoLTE (Most Important Fix)
This is the #1 solution.
VoLTE allows calls and mobile data to run together on 4G.
On Android:
- Go to Settings
- Tap Mobile Network
- Select your SIM card
- Enable “VoLTE” or “4G Calling”
On iPhone:
- Go to Settings
- Tap Cellular → Cellular Data Options
- Tap Voice & Data
- Select “LTE” or “5G Auto” with VoLTE enabled
Try this first. It fixes the problem in most cases.
Force Network Mode to 4G/5G
If your phone is allowed to switch networks freely, it may drop to 3G during calls.
Fix:
- Go to Mobile Network settings
- Set Preferred Network Type to:
- “4G/5G only” or “LTE preferred”
This prevents fallback that kills your data.
Check Carrier Support
Not all carriers support VoLTE properly in every area.
If VoLTE is missing or not working:
- Try another SIM card (same phone)
- Or contact your carrier to confirm VoLTE is active
This usually gets overlooked.
Reset Network Settings
If settings are corrupted after updates, this helps.
Steps:
- Go to Settings
- Find “Reset” options
- Tap “Reset Network Settings”
This will remove saved WiFi and Bluetooth, so be ready.
Update Your Phone
Sometimes this issue comes from software bugs.
- Check for system updates
- Install any pending updates
This usually improves network stability.
If It Still Doesn’t Work
If nothing above fixes it, here are less common causes:
- Your area doesn’t support VoLTE yet
- Your SIM card is outdated (older SIMs often lack VoLTE support)
- Your phone model doesn’t fully support your carrier’s bands
- Dual SIM conflict (one SIM may force network downgrade)
Try switching SIM slots or using only one SIM temporarily.
Also, if you’re dealing with frequent network switching issues, this guide might help:
mobile data stops when switching bands
Extra Tips to Prevent This Issue
- Keep VoLTE enabled at all times
- Avoid forcing 3G/2G unless necessary
- Use updated SIM cards (replace if older than 3–5 years)
- Keep your phone software updated
- Disable unnecessary network optimization apps
Most people skip this step: checking SIM compatibility. But it matters more than you think.
FAQ
Why does my internet stop during phone calls?
Because your phone switches to a network (like 3G) that can’t handle voice and data at the same time.
Does VoLTE fix this issue?
Yes. VoLTE allows calls and mobile data to work simultaneously on 4G networks.
Why is VoLTE not showing on my phone?
Your carrier may not support it, or your SIM card may be outdated.
Can dual SIM cause this problem?
Yes. One SIM can force the phone to downgrade networks during calls.
Is this a hardware problem?
Rarely. In most cases, it’s just a network or settings issue.
Final Thoughts
If your mobile data disappears during calls, it’s almost always a network handling issue — not a broken phone.
Start with VoLTE. That’s the key.
If you’re still troubleshooting network problems, check out another fix guide to keep your connection stable.