Telegram Calls Drop When Locking iPhone. Fix iOS Background Activity Restrictions

If your Telegram calls suddenly disconnect whenever you lock your iPhone, you may be facing iOS background activity restrictions. This guide explains why it happens and how to adjust your settings so that voice or video calls stay active, even when your screen is off.

1. Understanding the Issue

When an iPhone locks its screen, certain apps lose background privileges to conserve battery and system resources. If Telegram doesn’t have the right permissions or if iOS aggressively manages background tasks, your call may drop. Common causes include:

  • Strict battery or background app refresh settings.
  • Telegram’s background permissions not fully enabled.
  • Network transitions when the screen locks.
2. Enable Background App Refresh for Telegram

iOS can suspend apps in the background unless they have permission to refresh:

  1. Open the Settings app on your iPhone.
  2. Tap General > Background App Refresh.
  3. Ensure Background App Refresh is enabled globally, then scroll down and confirm Telegram is toggled on.
Tip: If Background App Refresh is set to “Wi-Fi Only,” switch it to “Wi-Fi & Cellular Data” if you rely on mobile data for calls.
3. Check Battery Settings and Low Power Mode

Low Power Mode can aggressively limit background tasks, affecting Telegram calls:

  • Go to Settings > Battery and see if Low Power Mode is enabled.
  • Disable Low Power Mode if you frequently make long calls on Telegram.
  • Keep an eye on your battery level; iOS automatically suggests Low Power Mode when battery is below 20%.
4. Allow Telegram to Use Cellular Data (If Applicable)

If you rely on mobile data for calls, ensure Telegram has permission to use it:

  1. Open Settings > Cellular (or Mobile Data).
  2. Scroll down to find Telegram and ensure it’s toggled on.

Without this permission, Telegram may disconnect calls as soon as the screen locks on mobile data.

5. Check Network and VPN Settings

Some VPNs or network transitions can cause call drops when the iPhone locks:

  • Disable VPN Temporarily: If calls stabilize without a VPN, consider switching to a more reliable service.
  • Switch Networks: Try using Wi-Fi if you’re on mobile data, or vice versa, to see if the call quality improves.
6. Reinstall or Update Telegram

If none of the above steps work, there might be a bug or corrupted data:

  • Check for Updates: Go to the App Store and update Telegram to the latest version.
  • Reinstall Telegram: Uninstall the app, restart your iPhone, and reinstall a fresh copy from the official store.
Conclusion

Dropping calls when locking your iPhone is often due to iOS background restrictions and battery-saving features. By enabling Background App Refresh, disabling Low Power Mode, and ensuring Telegram has the necessary permissions, you can maintain stable audio and video calls even with the screen off. If the problem persists, consider checking network settings or reinstalling the app for a clean slate.

With these fixes, you can enjoy uninterrupted Telegram calls—no matter how long your screen stays locked!

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