What Is com.samsung.android.app.telephonyui (InCallUI)?

com.samsung.android.app.telephonyui is Samsung’s InCallUI — the system interface you see during an active phone call. Answer, reject, mute, speaker, keypad, hold, and (on supported models and regions) call-recording entry points all live in this package. If you saw the name in App info, battery stats, or a forum scare post, you are looking at core Galaxy call UI — not a random app you installed from an ad.

This guide explains what the package does, when it is safe to ignore, and how to fix crashing or blank call screens without “uninstalling system apps” tools that break telephony.

What telephonyui / InCallUI actually does

Think of the Phone app as two layers:

• The dialer / contacts / recent calls layer (often labeled Phone or Dialer)
• The in-call UI layer — what draws after a call connects or rings full-screen

com.samsung.android.app.telephonyui owns that second layer. It draws the in-call screen, wires buttons to the modem/telephony stack, and hooks Samsung-specific call features that vary by One UI version and CSC (country/carrier software). It is not a third-party “caller ID booster,” and it is not Google’s Phone app package name.

When InCallUI is healthy, you barely notice it. When it is not, symptoms look dramatic: call connects but the screen goes black, the UI freezes on “Calling…”, buttons stop responding, or the Phone app force-closes the moment a call starts.

Is com.samsung.android.app.telephonyui a virus?

No — on a normal Samsung Galaxy it is a preinstalled system package. Malware lists sometimes mention lookalike names because attackers spoof trusted-sounding packages. Verify before you panic:

Check	Healthy system app	Suspicious
Install source	System / cannot uninstall normally	Sideloaded APK / unknown
Package spelling	Exact com.samsung.android.app.telephonyui	Extra letters, “telephonyuii”, random publisher
Behavior	Quiet except during calls	Pop-ups, browser redirects, crypto miners
App info	Marked as system / Samsung	Demands Accessibility for “call protection”

If your phone was never rooted and the package shows as a system app, treat “delete telephonyui virus” blog posts as clickbait. Real call problems are almost always cache, overlays, a bad Phone update, or network issues — not a secret trojan hiding as InCallUI.

For broader “weird system package” panic posts, the same verification habit applies to helpers like com.wssyncmldm.

Permissions — why it needs so many

InCallUI needs phone, contacts, and microphone-adjacent permissions so it can show who is calling, route audio, and expose call controls. Revoking those permissions “for privacy” usually produces a broken dialer, not a safer phone. If a privacy guide tells you to strip Phone/InCallUI permissions, skip that advice for this package.

Third-party caller-ID or call-recorder apps that request Display over other apps are a different story. Those overlays often crash InCallUI when a call connects. Uninstall the overlay first; do not gut the system package.

Safe troubleshooting when calls misbehave

Work top-down. Stop as soon as calls stabilize.

1. Update Phone, System UI, and the OS

Open Galaxy Store and Play Store, update Phone / Samsung Phone / related call apps, then install any pending Software update. Many InCallUI crash waves track a bad staged update that Samsung patches within days. Avoid random “call fixer” APKs from search ads.

If the Play Store itself will not update apps, fix that path first: Google Play Store not working.

2. Clear cache (not data) for InCallUI and Phone

1. Settings → Apps → Show system apps (menu / filter)
2. Open InCallUI / Phone / related Call settings packages
3. Storage → Clear cache
4. Reboot and place a test call to voicemail or a second phone

Clear data only if cache fails and you accept losing dialer preferences — still better than package destroyers.

3. Remove call overlays and “draw over apps” tools

Uninstall recently added:

• Call recorders that float on the call screen
• “Caller ID” apps from aggressive ads
• Launcher or theme tools that inject call UI

Then test in Safe Mode (hold Power → long-press Power off → Safe Mode on most Galaxies). If calls work in Safe Mode, a third-party app is the culprit — uninstall recent downloads one by one.

4. Reset app preferences

Settings → Apps → menu → Reset app preferences restores default links for Phone/SMS without wiping personal data. Useful when a third-party dialer stole the default and left InCallUI half-wired.

5. Network sanity check

A crashing UI is software. “No Service” or failed calls with a stable UI is radio/carrier. If the status bar is the real problem, see iPhone no service for the general cellular triage mindset, and on Android also rule out airplane glitches with a force restart.

6. Storage and boot health

Critically full storage makes system UIs crash in ugly ways. Free space with the Android storage full checklist. If the phone starts reboot-looping after a call-related update, escalate to Android boot loop recovery instead of freezing packages.

When hardware or shop work enters the picture

Software steps will not fix:

• No mic/earpiece after a drop or liquid event
• Calls die when the phone flexes (board/cable)
• Persistent crashes after an unofficial screen or board swap

Before you hand the phone over, follow before sending a phone for repair: back up, migrate 2FA, and document whether calls worked before the shop visit. After a display job, biometric quirks are common — Samsung owners often need fingerprint after screen replacement more than dialer surgery.

Do not do these

• Uninstall or “freeze” telephonyui with package destroyers
• Flash random dialer mods or “One UI call fix” ZIPs
• Grant Accessibility to shady cleaners that promise to remove it
• Ignore a pattern that started the hour you installed a caller-ID app — remove that app first

How to describe the bug to Samsung Members / support

Include:

• Exact One UI / Android version (Settings → About phone)
• Whether the crash is on outgoing, incoming, or both
• Whether Safe Mode fixes it
• Recent apps installed before the issue
• Whether Wi‑Fi Calling or dual SIM is involved

That detail gets you a real patch note instead of a generic “clear cache” reply you already tried.

Related FixingHacks guides

• What is com.wssyncmldm
• What is Finder app on Android
• Google Play Store not working
• Android boot loop recovery
• Samsung fingerprint after screen replacement
• Before sending a phone for repair

Bottom line

telephonyui / InCallUI is Samsung’s core in-call UI. Leave the package installed, update Phone and system software, clear cache, and remove overlays. Treat “uninstall system call UI” advice as how people break dialers — not how you fix them.