Vivo X100 Pro: Cellular dropped calls

By Sai Kiran Pandrala · reviewed by Sai Kiran Pandrala, Editor Last verified: 2026-05-30

What's happening

You hit cellular dropped calls on your Vivo X100 Pro. This is one of the more common issues users report with this Mobile Phones category, and most of the time it's recoverable without a service centre visit.

Quick checks first (5 minutes)

1. Power-cycle: unplug for 60 seconds, plug back in, retry.
2. Check the obvious: cables seated, batteries fresh, switches on, breaker not tripped.
3. Try a different known-good accessory (cable, remote, app, network) to rule out an external cause.
4. Check the Vivo status page / community forum for known outages or release-notes for your firmware.
5. Note the exact symptom and any error code on display , you'll need it if escalation is required.

Step-by-step fix

1. Identify the trigger. Did this start after a firmware update? After a power surge? After a software / app change? Each of these has a different root cause.
2. Apply the safe fix first. For most "cellular dropped calls" cases on a Vivo X100 Pro, the working sequence is:

- Soft reset (power-off, wait, power-on).

- App / firmware update to the latest stable release from the official Vivo support page.

- Re-pair / re-discover the device via the Vivo companion app if applicable.

1. If the soft fix fails, do a controlled hard reset. Back up settings + data first. Then factory-reset following the Vivo X100 Pro manual. Re-enrol from scratch.
2. Test the suspect path. Reproduce the original failure deliberately to confirm the fix held.
3. Document the outcome. Note what worked. If the issue returns, you have a faster path next time.

When to call Vivo support

• Issue returns within minutes of a fix.
• Device shows a hardware error code on display.
• Visible physical damage, burn smell, or swollen battery.
• Out-of-box failure within the warranty window.

Avoid recurrence

• Keep the firmware on the latest stable channel.
• Use a surge-protected outlet, especially in India where line voltage swings hard.
• Avoid third-party accessories that aren't certified by Vivo.
• Schedule a periodic maintenance check (clean filters, replace consumables, recalibrate where applicable).

Frequently asked questions

How long should this take?

Most users get through the procedure in 15-30 minutes. Allow longer if you're doing it for the first time on this specific model.

Will this work on older variants of the same model?

Most steps apply across firmware generations. Menu paths may shift; use the official manual for your specific revision.

What if my variant is region-locked?

Check the model code on the rating plate. Region-locked variants sometimes have features disabled. The brand support portal will confirm what's available for your region.

Does this void warranty?

Operating the device per the user manual and applying firmware updates from the official brand portal does NOT void warranty. Opening sealed components, third-party repair, or unauthorised mods can void warranty.

Related guides

• All Mobile Phones guides -> /devices/section/mobiles.html
• All device categories -> /devices/

Related fixes

Related guides worth a look while you sort this one out:

• Apple iPhone 16 Pro: Cellular dropped calls
• Google Pixel 9 Pro: Cellular dropped calls
• Oppo Find X8 Pro: Cellular dropped calls
• Vivo X100 Pro: Battery health dropped 80
• Vivo X100 Pro: Microphone not working calls
• How to back up to iCloud on Vivo X100 Pro

References

• Official brand support portal for your model.
• Brand community forum + Reddit (search "Vivo X100 Pro: Cellular dropped calls").
• manufacturer repair guides guide if applicable.

Reference material, not professional advice. Validate with your manufacturer manual and follow local regulations.

What changed recently?

Fault diagnosis on a Vivo device goes faster when you map the symptom to a recent change:

• Did firmware update in the last 7 days?
• Did the network (router, ISP, VPN) change?
• Was the device moved physically?
• Did paired devices (phone, hub, app) update?
• Were any accessories swapped in or out?

The answer narrows the root cause to a manageable subset.

Before you start

A few things to confirm so the Vivo device fix goes cleanly:

• Latest firmware downloaded if you're going to update.
• Warranty + support contract status checked — opening sealed parts may void it.
• Backup of current configuration (where applicable) taken.
• Spare parts on hand if you anticipate replacement.
• Adequate workspace, lighting, and time, rushing causes regressions.

How to confirm it's actually fixed

On a Vivo device, the test is rarely "reboot and see". Use this list:

• Active reproduction: trigger the original failure path on purpose.
• Indirect reproduction: do an activity that would expose the same subsystem.
• Status indicator review: every LED / display / app status should be green.
• 24-hour soak: leave the device under normal load overnight; check the next morning.
• Telemetry check: review the device or app's diagnostic log for new error entries.

When to call Vivo support instead

Escalate if:

• The same symptom returns within 24 hours of a clean fix.
• You see physical damage (burn marks, swollen battery, cracked PCB).
• The device is in warranty and a hardware replacement is the cheaper outcome.
• Repair requires specialised tools you don't own (alignment jigs, calibration software).
• Following the official path keeps the warranty intact, which matters more than the time spent.

More frequently asked questions

Are there safer alternatives for non-technical users?

Yes: the manufacturer's self-service troubleshooter (HP Smart, LG ThinQ, Samsung Members, similar) usually walks through the same steps in a guided UI. Use that first if you're not comfortable with menu paths.

What if my model isn't exactly the same revision?

Cross-check the model code on the rating plate against the manufacturer support page. Major firmware generations sometimes shift the menu path; the option is usually under a similarly-named section.

What if the fix returns after a reboot?

Persistent fault returns mean either: a hardware fault (escalate), a configuration that's being overwritten by a sync source (check cloud profiles), or a regression in a recent firmware update (rollback).

Can I roll this back if something breaks?

Yes for software-level changes (firmware rollback, config rollback). Hardware changes are usually one-way. Always back up settings before starting.

Does this affect other devices on my network?

Generally no. The procedure is local to this device. Network-side changes (firmware updates that affect TLS, SMB, or routing) are flagged explicitly in the steps.

Field notes from real Mobile Phones incidents

When I work on Vivo X100 Pro: Cellular dropped calls the rhythm I lean on is the one I have built over years of these tickets. A phone that 'won't charge' is the cable 60% of the time; switching the cable before I switch the phone has saved me a lot of misdiagnosis. Battery health in the system menu is the single most honest data point on any mobile device; never trust a sticker on the back. Safe mode is the cheapest diagnostic on any Android, if the symptom is gone there, it is a userland app, not the OS.

Tools I actually reach for

For Vivo X100 Pro: Cellular dropped calls on Mobile Phones the cheapest signal I can land usually comes from Bluetooth LE scanner on a second device, then Manufacturer companion utility (Samsung Smart Switch, Xiaomi Mi PC Suite, etc.), Wi-Fi analyser app, Battery health menu (iOS Settings -> Battery, Android *#*#4636#*#*) when Bluetooth LE scanner on a second device cannot see the layer the fault sits in, and Recovery mode (vendor-specific key combo) for the cases where neither of those answers cleanly. That ordering is not academic. It matches the layers the failure tends to surface through, so the cheap signal lands first and the heavier tooling only comes out when the simpler answer does not hold up under scrutiny.

Verification I run before I close the ticket

Before I mark Vivo X100 Pro: Cellular dropped calls resolved on a Mobile Phones unit, the verification loop below is what I actually run. Each step proves a different layer is green, and the order matters - the cheap checks gate the more expensive ones.

Charge with a different known-good cable and adapter for 30 minutes

If that one comes back clean, move to the next check. If it does not, stop and dig in there before layering more verification on top of a red signal.

Boot to safe mode to rule out a third-party app

If that one comes back clean, move to the next check. If it does not, stop and dig in there before layering more verification on top of a red signal.

Run the manufacturer's built-in diagnostics (Samsung Members, Mi Service, etc.)

If that one comes back clean, move to the next check. If it does not, stop and dig in there before layering more verification on top of a red signal.

Soak the device under normal use for 24 hours before declaring the fix held

Only when every line above runs clean do I close the ticket and update the runbook with the timestamps.

Where I check first when the docs disagree

When two sources contradict each other on a Mobile Phones detail, the disambiguation order I lean on is stable. I usually start at GSMArena specs reference for the ground-truth view on Mobile Phones. I usually start at FCC ID database for the ground-truth view on Mobile Phones. I usually start at manufacturer firmware archive for the ground-truth view on Mobile Phones. I usually start at manufacturer support portal for the ground-truth view on Mobile Phones. Random blog posts and reseller wikis are signal, not ground truth, and I treat them as such until the references above either confirm or contradict the claim.

Pitfalls I have walked into on this exact path

The shortcuts that look smart on Vivo X100 Pro: Cellular dropped calls have a habit of biting back. The pitfalls below are the ones I have personally walked into on a Mobile Phones unit, not things I read about. A phone that 'won't charge' is the cable 60% of the time; switching the cable before I switch the phone has saved me a lot of misdiagnosis. Battery health in the system menu is the single most honest data point on any mobile device; never trust a sticker on the back. When in doubt I revert to the slower path that the manual prescribes - the time I save by skipping it is always smaller than the time I spend cleaning up afterwards.

What I tell the next on-call

When I hand Vivo X100 Pro: Cellular dropped calls off to the next person on rotation, the three lines I leave in the runbook are these. First, the symptom signature for Mobile Phones on the Mobile Phones family - not a paraphrase, the exact string that surfaces. Second, the diagnostic that gave the highest signal in the least time. Third, the exact verification command whose green output justified closing the ticket. That trio is what turns a one-off fix into a runbook entry the next engineer can use without paging me at three in the morning.

I also add a one-line note on the cost of getting this wrong. For Vivo X100 Pro: Cellular dropped calls on a Mobile Phones unit, the cost is rarely the replacement part. It is the downtime, the second site visit, and the trust deficit you spend with whoever owns the asset when the fix does not hold. That framing keeps the next on-call from choosing the cheap-looking shortcut that ends up costing the most in elapsed hours and goodwill.