How to Fix iPhone 6s Plus “Call Failed” Errors (Can’t Make Outgoing Calls)

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Is your iPhone 6s Plus suddenly showing a “Call Failed” error whenever you try to make a call?
It’s a common (and frustrating) issue that many iPhone users experience—and the good news is, in most cases, you can fix it yourself.

Here’s your complete guide to why it happens and all the ways to troubleshoot and solve the problem.

Why You Might See “Call Failed” on Your iPhone 6s Plus

  • Network problems or outages from your carrier
  • Software glitches affecting the Phone app
  • Incorrect iPhone settings (Airplane mode, Do Not Disturb, Caller ID, etc.)
  • Account issues (like a suspended or unpaid mobile plan)
  • SIM card problems or damage
  • Hardware damage (if the phone was dropped or exposed to water)

How to Fix iPhone 6s Plus Outgoing Call Issues

Step 1: Check Your Carrier and Account Status

Before troubleshooting your iPhone, check with your carrier:

  • Make sure your mobile plan is active and your account isn’t suspended.
  • Ask if there are any local network outages or service problems.
  • Verify that roaming isn’t blocked if you’re outside your usual coverage area.

Step 2: Check Airplane Mode and Other Settings

A simple toggle might be the issue.

  • Go to Settings > Airplane Mode. If it’s ON, turn it OFF.
  • Swipe up from the bottom of the screen and check if the Airplane Mode icon is enabled in Control Center.

Step 3: Toggle Caller ID and Disable Call Blocking

Your call might fail if Caller ID isn’t properly set up or the number is blocked.

  • Go to Settings > Phone > Show My Caller ID and make sure it’s turned ON.
  • Also check Settings > Phone > Call Blocking & Identification to make sure the number you’re calling isn’t accidentally blocked.

Step 4: Reinsert Your SIM Card

Sometimes, the SIM card isn’t seated properly.

  • Power off your iPhone.
  • Use a SIM eject tool (or paperclip) to remove the SIM card.
  • Reinsert it carefully and reboot the device.

Step 5: Check Network Settings

If you’re in a good coverage area but still can’t make calls:

  • Go to Settings > Cellular and make sure Cellular is turned ON.
  • Install any available carrier updates:
    • Settings > General > About (if an update is available, you’ll see a prompt).

Step 6: Reset Network Settings

Resetting network settings can fix hidden issues without erasing your data.

  • Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.
  • Note: This will erase saved Wi-Fi passwords.

Step 7: Update iOS

Software bugs could be causing the call failure.

  • Go to Settings > General > Software Update.
  • Download and install any available updates.

Step 8: Restore Your iPhone

If nothing else works, a factory reset could clear out deeper glitches.

Warning: This erases all your data, so make sure to back up first.

  • Go to Settings > General > Transfer or Reset iPhone > Erase All Content and Settings.
  • Or connect your iPhone to a computer and restore through iTunes.

Other Helpful Tips

  • *Dial #31# on your iPhone. This can disable any hidden call blocking settings linked to your number.
  • Try switching network modes (like from LTE to 3G) under Settings > Cellular > Cellular Data Options.
  • Double-check the number you’re dialing. If it’s just one number giving you trouble, the issue may be on their end.

When to Contact Apple Support

If you’ve tried all of the steps above and still can’t make outgoing calls:

  • Contact Apple Support or schedule a Genius Bar appointment.
  • Visit your carrier’s store for help with network issues or a replacement SIM.
  • If hardware damage is suspected, professional repair may be needed.

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