Galaxy S7 disconnects from cellular network automatically, signal keeps dropping, other issues

Calling issues are some of the least reported troubles for the #GalaxyS7 so there’s not much literature about it. The fact is, most voice calling problems are caused by an issue on the network side so device troubleshooting is minimal. Nevertheless, we still need of publishing an article about them so here it is.

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When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

Below are specific topics we’re bringing for you today:

Problem 1: Galaxy S7 disconnects from cellular network automatically

I am in a rural area where cell and WIFI signals are spotty. When I move to a low or no signal area, the phone signal and the WIFI signal are lost, but when I move back to an area with a strong cell and WIFI signal, the phone does not reconnect automatically. It works fine after I cycle the phone off and then on again, or when I cycle airplane mode on and off again. Is there something I can do to fix this problem? — Tito

Solution: Hi Tito. Ideally, a smartphone is supposed to automatically reestablish a connection once it’s back in an area with good cellular connection. If that’s not happening, there may be an operating system bug that may have developed after some time.

In some cases, network issues can be fixed by installing updates. Modem manufacturers regularly release updates for their chips from time to time and these updates are bundled with carrier or Samsung updates. If there’s an available update for your operating system, make sure not to skip them.

If there’s no available update whatsoever, make sure to factory reset your device. It may help eliminate the OS bug. Here’s how to do that:

  1. Turn off your Samsung Galaxy S7.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  5. Using the Volume Down key, navigate through the options and highlight ‘wipe data / factory reset.’
  6. Once highlighted, you may press the Power key to select it.
  7. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  8. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  9. The phone will now reboot longer than usual.

Problem 2: Galaxy S7 can’t leave message to voicemail

Whenever I make a phone call and the other party does not answer it acts like my call will go to their voicemail, but there is silence. I’ve tried calling multiple people that I know have VM, but I get the same result in all lines. — Ronniev93

Solution: Hi Ronniev93. In a voice calling setup, there are two networks involved — yours and the contact’s. This issue can be network-related so we recommend that you get help from your carrier. Your problem description is very generic and does not point to anything in particular. We haven’t heard of it somewhere so it may be an isolated network problem. Talk to your carrier for support.

Problem 3: Unlocked Galaxy S7 won’t send SMS, cellular signal keeps dropping

Bought phone and was unlock to all networks. When I put my SIM in it shows up full signal and has the EE sign on but when I press to make a call, it just cuts it off straight away and won’t send texts. I have done all the fixes what has been said — hard reset, clear cache, etc., but still no good. What can I do? — Nat

Solution: Hi Nat. The best thing that you can do is to do some research about your phone and gather the following information:

  • phone model number
  • identify if it’s a GSM or CDMA device
  • know what its operating frequencies

The phone model number can easily be found under Settings>About device. Once you have that information, do some Google research to know the last two. Afterwards, you want to talk to your carrier and let them know about your problem. There may be some incompatibility issues causing it.

For example, if your phone’s radio frequencies are different from your carrier’s in your area, some or all services may not work. There’s no amount of software troubleshooting that you can do if a phone is not compatible in terms of frequencies. Network chip specifications can be changed by tweaking the software. Either your phone is compatible or not. This is why you’ll need to talk to your carrier so they can help you figure out the issue.

Problem 4: How to unlink multiple contacts in Galaxy S7 all at once

When i type name/number on phone keypad LINKED contacts do not show up. I want to know how to unlink ALL contacts in one go. Cannot tick off more than 3,000 contacts one by one!! If that is not possible is it possible that copying to SIM or phone will unlink contacts. Please help, stuck!! — SO

Solution: Hi SO. While it’s easier to link contacts in one go, unlinking them together is not possible. We’re not aware of any option to allow you to unlink multiple contacts at once. And no, copying contacts to a SIM card may or may not give you what you want. Keep in mind that a SIM card has very low storage space and it may not have enough resources to keep all 3000 of your contacts.

Problem 5: Galaxy S7 calling issue when using Whatsapp

Hello. My problem is quite weird and I don’t even know how I can explain it properly. After one hour of talking on WhatsApp (phone is locked, screen is black) the call starts to drop. If I press any button it continues but before that it gives this annoying sound as if it has no connection. Keep WiFi on during sleep setting is ENABLED and it the issue stays. It happens with both Wifi and 4G. I don’t know what to do and for me it’s important. I THINK (not sure) the problem doesn’t happen when the phone is charging (i cant confirm that yet). Is there a way you can help me out? Please? Thanks. — Dimitar

Solution: Hi Dimitar. If this erratic behavior only occurs when you’re using Whatsapp, it may or may not be a Whatsapp bug. Try wiping the app’s cache and data first to see if that will make any difference. Here’s how:

  1. Open the Settings menu either through your notification shade (drop-down) or through the Settings app in your app drawer.
  2. Navigate down to “Apps”. This may be renamed to something like Applications or Application Manager in OEM skinned versions of Android 6 or 7.
  3. Once in there, click on an application.
  4. You’ll now see a list of stuff that gives you information about the app, including Storage, Permissions, Memory Use, and more.
  5. These are all clickable items. You’ll want to click on Storage.
  6. You should now clearly see the Clear Cache and Clear Data buttons for the application.

Alternatively, you can also try to remove the app and re-install it. If that won’t work either, consider doing a factory reset. Refer to the steps above.

If everything fails, contact the developer to report a possible bug.

 


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