Samsung Galaxy S6 Wi-Fi Calling unstable, calls get dropped plus calling and network issues

This post will cover issues related to calling on a Samsung Galaxy S6 (#Samsung #GalaxyS6). It also includes the Wi-Fi Calling feature, which most carriers are now offering. There is also the common “Not Registered on Network” error, which may happen to anyone.


Other issues included in this post are unstable Wi-Fi Calling, total network connectivity problem, calls going straight to Voicemail and AVR (Automated Voice Response) issues.

If you have a problem other than what has been mentioned here, then visit our Galaxy S6 troubleshooting page to find issues related to yours. You may try the existing solutions first. If they didn’t work for you, then contact us by filling up this form accurately.

Galaxy S6 Wi-Fi Calling is unstable (Sprint)

First Email: I have no cell signal in my home (for any of the carriers). I went with Sprint because it offers true calling over Wi-Fi. That works here. My problem is that when my phone goes to sleep, it seems to shut off the Wi-Fi calling capability. So I can only receive calls if I’m keeping the phone awake. Is there any setting I can use to keep the phone from going to sleep? (I’ve already extended its awake time to the max… 10 minutes, and propped it up so it sees me if I’m in the vicinity.)

Second Email: I have no cell signal in my house. So I chose Sprint and Galaxy S6 because it offers calling over Wi-Fi. My problem is that it’s unstable. Several times a day, the Wi-Fi calling has become disabled, even though the Internet is up and running. I can usually start up Wi-Fi calling again by using the phone settings to turn off Wi-Fi and turn it back on again… if I notice. If I don’t notice, I can’t receive any calls or texts.

Is there anything I can do to make this capability more stable? I am utterly dependent on its working.

Troubleshooting: There’s no need to extend the screen timeout for this issue. The fact is there’s a setting that will keep the Wi-Fi on even if the phone goes to sleep or becomes idle. But before that, I think your problem is actually just the phone disconnecting from your Wi-Fi network when it goes to sleep. So, please follow these steps:

  1. Tap the Menu key on Home screen
  2. On the pop up menu select Settings
  3. Here make sure that the slider next to the Wi-Fi option shows ON
  4. Tap Wi-Fi
  5. Tap the Menu key then select Advanced
  6. Tap Keep Wi-Fi on during sleep
  7. On the pop up menu select Always. When the dot indicator shows green means this option is selected.
  8. Now the phone’s Wi-Fi will remain connected to the Wi-Fi network even if your phone is asleep

On the stability of the Wi-Fi calling feature, as long as your Wi-Fi network is stable, there’s not much we can do about it but Sprint can. I hope I made my point.

Galaxy S6 keeps dropping calls (Vodafone)

Problem: Hi guys, I have my phone Galaxy 6 for a few months with same provider Vodafone. Lately my phone calls seems to drop off while I am talking. I’ve done a factory reset but its very annoying when I’m on the phone and every single time after a few minutes the calls drops off. So the reset didn’t do anything. Can you help? It’s still under warranty but I’m really annoyed that after I paid so much money has to be fixed already. Thanks.

Suggestion: You need to report your problem to Vodafone. Unless the phone has issues with its hardware that handles radios, the problem is often on the network side. The best thing to do is report the problem and bring the phone in to be checked by its technicians for further testing. However, before you do that, try to do the master reset first to rule out the possibility that it’s just a firmware or app issue. After all, it will be reset in the shop.

  1. Turn off your Samsung Galaxy S6.
  2. Press and hold the Volume Up, Home and Power keys together.
  3. When the device powers on and displays ‘Power on logo’, release all keys and the Android icon will appear on the screen.
  4. Wait until the Android Recovery Screen appears after about 30 seconds.
  5. Using the Volume Down key, highlight the option, ‘wipe data/factory reset’ and press the Power key to select it.
  6. Press the Vol Down button again until the option ‘Yes — delete all user data’ is highlighted and then press the Power key to select it.
  7. After the reset is complete, highlight ‘Reboot system now’ and hit the Power key to restart the phone.

Galaxy S6 showing “Not Registered on Network” error (EE)

Problem: Error message “Not Registered on Network,” for the last 2 weeks, phone 3 months old. Did SIM swap this morning. Will make calls via router using Wi-Fi calling. Rebooted several times, changed to 2G/3G. Selected network (EE) several times comes up then drops out. Thanks.

Suggestion: It has something to with provisioning. You need to call EE for that. Yeah, that’s the first thing you need to do because problems like this is often network-related.

Complete connection outage with Galaxy S6

Problem: I’m facing a complete connection outage with my Samsung Galaxy S6. It happened twice so far. The first  time the outage lasted for about 30 minutes but this time I’ve been facing this outage for 2 hours now and still nothing. No calls, no data connection. NOTHING!

I’ve tried everything. The flight mode toggle, the network operators thing, I’ve tried my SIM on another phone and it worked just ok. Please advise.

Troubleshooting: I understand you already tried everything but more often, this problem can be fixed by a simple reboot or force reboot: press and hold the Volume Down and Power keys together for 20 seconds. If this won’t work either, then try the wipe cache partition method:

  1. Turn off the device.
  2. Press and hold the following three buttons at the same time: Volume Up key, Home key, and Power key.
  3. When the phone vibrates, release the Power key but continue to press and hold the Volume Up key and the Home key.
  4. When the Android System Recovery screen appears, release the Volume Up and Home keys.
  5. Press the Volume Down key to highlight ‘wipe cache partition.’
  6. Press the Power key to select.
  7. When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
  8. Press the Power key to restart the device.

After this problem persists for a few more hours, reset your phone and send it in for proper diagnosis.

Calls go straight to voicemail on Galaxy S6 (AT&T)

Problem: I have been able to make calls but haven’t received any calls, just go straight to voicemail. My signal bars are usually from 1 to 3 and it’s probably due to poor signal and I have reset it before and receiving calls wasn’t a problem. Any other suggestions?

Suggestion: If all calls go straight to voicemail, call your service provider. I’m sure they can fix it right away. However, if only a few or some of the calls go to VM, then it’s probably coverage problem. But if you’re getting errors or if the phone tends to freeze or hang when it rings, do the master reset. Don’t forget to backup your data, though.

Automated Voice Response (AVR) can’t recognize dialed number

Problem: After I make a call to a company that puts me in a queue and asks me to push 1 for English or for whatever department, I hit the number and usually I even here the dial tone, but the other end NEVER hears it. NEVER.  I am ALWAYS permanently stuck in queue. My dial tone doesn’t seem to be working. I found others had this problem with earlier versions for Samsung phones and some said their work around was to use AndroiDTMF or Easy Tone Dialer, but those apps aren’t working for me either.  Any suggestions?  Oh, I bought this phone in Spain.  I am roaming in the USA with a  That SIM card company has been worst than useless in that they won’t even acknowledge that this problem could possibly exist.

Suggestion: More often than not, it’s an issue with the system and not the phone. There’s nothing we can do to fix that as it’s beyond our reach. I understand the provider won’t acknowledge it but reporting the problem is the only thing you can do.

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