Why using a task killer on Galaxy S7 is not helpful, other issues

Here’s another collection of issues for the #GalaxyS7 series. We hope that the solutions we mention here today can help our ever-growing community.


Below are the complete list of issues discussed in this material:

  1. Why using a task killer on Galaxy S7 is not helpful
  2. Dual SIM Galaxy S7 keeps losing mobile signal
  3. Gmail notifications deletes emails from inbox of Galaxy S7
  4. Galaxy S7 can’t send and receive SMS when connected to Wi-Fi

If you are looking for solutions to your own #Android issue, you can contact us by using the link provided at the bottom of this page, or you can install our free app from Google Play Store.

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.

Problem #1: Why using a task killer on Galaxy S7 is not helpful

Hello again. This is Scott and I just asked you 3 VERY LONG questions, but forgot to include these 2 quick ones…so this should be easy 🙂

You advised above to use “Advanced Task Killer” to close all the unused, memory-draining apps running in the background. I have always used one of these Advanced Task Killing apps faithfully in the past. However, over the last 1 or 2 years, many Support help, salespeople, tech’s, etc usually tell me the following (..but I’m actually GONNA USE YOUR ANSWERS this time around!):

  1. NEVER use a task killer now since Android already has this built into their operating system (I have always used “Clean Master” by Cheetah — the one with the blue & yellow broom sweep icon) and if that’s a good app & is any indication of what Android DOESN’T close on its own, then I would “personally” agree with you to still use a task killer!!
  2. Never stop or disable ANY of the system apps (to be clear, I’m ONLY talking about all the apps with the standard little a green Android guy) found under “Applications” because I go to disable or uninstall bloatware, apps I don’t like to use, and some of the system apps (those that have in their name something which is CLEARLY RELATED TO SOMETHING I DON’T NEED OR USE).

So… I would very much appreciate your comments & opinions on what I’ve been being told re: the above.  And if you still suggest using an Advanced Task Killer from Google Play, and/or suggest stopping some clearly unneeded system apps, then:

 – which Advanced Task Killer would you use (i.e. there are several highly rated ones out there, with many of them using the same green droid icon as well.  So WHICH DEVELOPER’s Task Killer would you suggest?

-if in fact we CAN and/or SHOULD actually stop some system apps (including any that clearly have in their name something related to an app I don’t use), is there a guideline, or list, or those which we can manually disable or uninstall??

-I mentioned that I use the “Clean Master” app… do you like and/or recommend that app? If so, can I use THAT as my task killer, or should it do its own thing, or should I not use both together??

Again, I’m so appreciative of any help you can give, as I’m certain many others are too!!

Too many apps running in the background will drain the memory allocated to the apps you need. To maintain your phone, you should occasionally stop the apps running in the background that you are no longer using. — ScottE

Solution: Hi ScottE. Technically, third party task killers are redundant since Android operating system is designed to manage resources (like memory and cache) on its own intelligently. Task killer apps evolve from our previous experiences with Windows PC, which always advocate for more RAM (random access memory). In Windows computing, we were taught that our PCs should run faster if RAM is more than enough. Well, Android isn’t Windows and resource management for both platforms are different.

What you must keep in mind is the fact that Android works fine even if its RAM is full. This is how it’s designed and how it’s supposed to do its job. Android keeps all apps in a semi active state all the time after initially loading them at startup in order to launch them quickly. Seeing your phone’s RAM leveling at 80-90% should not be a cause for concern. In Android environment, unused RAM is a wasted resource. If the operating system needs more memory to accommodate a large application like a graphics-heavy game, it will simply kick out some apps it thinks you don’t need in order to provide more RAM. You don’t have to manually close an app/s first to ensure your S7 has enough RAM before opening a large app.

Closing an app yourself or via a task killer will only momentarily free up some memory and cache resources. It will eventually reactivate itself once again after some time (though it will not necessarily show as active). It is in this sense that we can say task killers are redundant and not necessary. In most cases, task killers are not any help at all, and some even can lead to troubles. For a brief discussion whether or not task killers are helping, follow this link.

If your main concern in sending these questions is on how to optimize your S7, then simply keep the number of installed apps to a minimum. Remember, the more installed apps you have, the more resources are needed to run them, both in active and semi-active states. Uninstall apps you don’t need. A good general rule of thumb in this case is to see if you have an app you haven’t used for at least two weeks and uninstall it. If you haven’t loaded an app that long, chances are it’s not that important to your digital lifestyle.

You also want to stick to official or mainstream apps only. Apps from well-funded developers tend to be well-maintained. They also receive regular checks to minimize bugs and problems compared to less popular products.

Again, we don’t usually recommend using task killers so we can’t give any specific product that you can try.

Problem #2: Dual SIM Galaxy S7 keeps losing mobile signal

This is a dual SIM phone with two Virgin mobile nano sims installed, G935FD unlocked, so should work OK in the UK. I know I am in an area with variable mobile signal, but never had any problem with full size SIMs in an S3, and my daughter has no problem with her Virgin mobile sim in an S5.

The network connections seem to change in strength minute by minute and 9/10 times I can’t even send a SMS. Sometimes I can get both sims back if I switch on and off, but I seem to lose the signal especially if the phone has been on standby – it’s almost as though it’s lost the signal while it’s not been active.

Is there a way of making it re-connect properly when it wakes up?  Turning aeroplane mode on and off isn’t sufficient to fix things – only a formal off and on seems to work and even then not every time. I’ve read your page on trouble shooting the S7 that won’t send SMS messages and the settings on both SIMS – one 2G (in slot 2) and one 3G (in slot 1) seem fine. I’d welcome any clues for anything else that I could try. — Julia

Solution: Hi Julia. If you’ve checked some of our troubleshooting pages, you should know by now that if software solutions don’t work, that’s a go ahead signal for you to seek hardware resolutions. And as far as software troubleshooting is concerned, there’s really nothing much that you can do on your end. The first thing that you want to do is to check if changing some options under Network/mobile network settings will work. Try to switch between different network modes and network operators to see if the situation improves.

The next thing that you can do is to wipe the cache partition. This type of cache, also known as system cache, is one of the caches used by the device’s operating system to load apps properly and efficiently. It works differently than an app cache but it can also mess the basic functions of some apps if it’s corrupted or outdated. To clear it, just follow the steps below.

  • Turn off the phone.
  • Once the phone has completely shut down, press and hold Volume, Home, and Power buttons at the same time.
  • Wait until the Samsung logo appears before releasing the Power button.
  • Once the Android logo shows up, release the two other buttons.
  • Wait for the Recovery menu to appear (may take up to a minute).
  • Go to wipe cache partition option using the Volume buttons, then press Power button to confirm.
  • Wait for the device to wipe the cache partition
  • Once the cache has been deleted, Reboot system now option will then be highlighted.
  • Press Power button again to confirm the reboot.

You can also observe how your phone behaves when you disable all third party apps temporarily. There’s a chance that the problem is app related so booting your S7 in safe mode is the next logical step. Keep the phone in safe mode during the observation period to know the difference. While safe mode is enabled, all third party apps are prevented from running so if any of them is the reason for the trouble, you should know it. Observe the phone for at least 24 hours while safe mode is enabled. Follow the steps below:

  • Turn your Galaxy S7 off.
  • Press and hold the Power button.
  • Once the ‘Samsung Galaxy S7’ logo appears, release the Power key and immediately press and hold the Volume Down button.
  • Continue holding the button until the phone finishes rebooting.
  • Once you see the text “Safe mode” at the bottom left corner of the screen, release the Volume Down button.

If your phone will continue to lose network signal strength, you can try the ultimate software solution of factory reset. Like in safe mode, make sure to observe the phone again for another 24 hours. If this solution will not yield any positive result and signal strength remains spotty, it’s time to consider for a unit replacement.

Problem #3: Gmail notifications deletes emails from inbox of Galaxy S7

This is an issue with the email app that comes bundled with Samsung phones: Galaxy S7 and Note 3 on Verizon and Mega on US Cellular. I believe it’s the same email app on all three (they look the same, but there is no version number or even vendor ID provided…it’s just embedded in the OS).

The symptom appears to be unique to Gmail when using POP3 on the Samsung email app. The mails show up as they should but you can’t read them.  Why? The “notification” of the email erases the email contents. They don’t go into the Trash folder, they simply disappear from the phone. If you turn notifications off for emails, this disappearing act also occurs whenever you hit the manual sync button on the phone: all the existing in-box messages disappear from view. Not deleted on the phone, not deleted on the email server, just invisible and inaccessible.

This has nothing to do with having another email client (e.g., a PC) polling the messages or erasing them. In fact, when you look at Gmail via the browser, they are correctly marked as “unread” (because, well, they haven’t been).

This symptom has been in place for years, and it is really annoying. It seems to only apply to email accounts hosted on Gmail and read on Samsung’s email client. I wouldn’t be surprised if this is an intentional bug planted by one side or the other… — David

Solution: Hi David. We have no idea this bug exists on Samsung email app in some Galaxy Note 3 and S7 devices. We tried to setup our own personal Gmail account in our S7 in our laboratory but we can’t seem to replicate the issue you’re having. This is either a Gmail issue or something that Samsung failed to address for a long time (and we are not aware of). Since there’s no easy way to identify where the bug comes from, we recommend that you contact both companies so you can raise this issue on their technical support team. We will do the same so we can update this post once we hear any update from them. This is, so far, is the only thing that we can do to help.

Problem #4: Galaxy S7 can’t send and receive SMS when connected to Wi-Fi

My phone has a serious problem with Wi-Fi and sending/receiving messages.

First, it never stays connected to a Wi-Fi signal for longer than a few minutes, leaving me to either reconnect or eat up data. On the rare occasions I am connected to Wi-Fi (and it clearly says I’m connected) my messages and the Internet tell me I don’t have connection and to try again later.

Second, I can’t send messages (or make phone calls, but to a somewhat lesser degree). When I’m connected to Wi-Fi, my texts either fail to send, say it will send when connected to Wi-Fi (even if I’m already connected), or send the message only to have the other person never receive it. This is the same when I make a phone call.

Finally, I don’t receive messages or calls. If I’m in a group message, I’ll only get 2 out of the dozens of texts everyone sent. I’ll get them out of order. I’ll get them two days after they were sent. I even got them all at the same time. I have rarely received a text message the way I was supposed to — on time and In the correct order.

I’ve had this phone for nearly half year now and this has always happened. I’ve missed important event’s because people couldn’t reach me. Other people have missed events because I couldn’t reach them.

I would also like to point out that this is a safety issue. Once when I was home alone, a man showed up at my door and started banging on it and yelling. I couldn’t text anyone. I couldn’t call anyone. Not even the police. I had to sit on my kitchen floor and wait for nearly half an hour until he left.

Everyone in my family has this problem, as we all have the same make and model phone. Everyone, especially me because of the situation I mentioned, is sick and tired of having this problem, and we are sick and tired of having to jump through hoops to try and get answers.

This was supposed to be an outline of the problem, but it turned into an angry rant. I would say I’m sorry, but I’m not. I just want answers, and I want this problem fixed. — Titanwaves

Solution: Hi Titanwaves. First of all, demanding answers from us for your safety issue is not really wise. Any safety concern that involves a cellular communication should be handled by your network operator and not by a third party like us. The fact that it’s been going on for months now should have prompted you to call them in the first place! Keep in mind that all texting- and calling-related problems are best addressed by the network operator because they are in a better position to provide relevant information. Text and call problems are caused by a number of factors and most of said factors are within a carrier’s control.

Also, if more than one smartphone is having the same problem with Wi-Fi, then you should consider checking if that Wi-Fi network you’re connected to is working as  it should be. Seeing the indication that your phone is “connected” to a Wi-Fi network does not necessarily mean that you’ll be able to connect to the internet. The “connected” status is only a confirmation that your device is communicating with the router or local area network (Wi-Fi network). The  local area network, however, needs to be able to connect to the internet first in order to allow other devices connected to it to, in turn, link to the web themselves. In other words, you must make sure that the Wi-Fi network is reliable and has constant internet connection first before you blame to your device. We haven’t noticed you mentioned this aspect in your rant above so we want you to work on this one first.

If Wi-Fi connection is stable all the time, or if the issue happens when you connect to other known, reliable Wi-Fi networks, then call your carrier and ask them for direct assistance regarding all your calling and texting problems. If they say there’s no network problems in the area, demand for phone replacement.


Engage with us

If you are one of the users who encounters a problem with your device, let us know. We offer solutions for Android-related problems for free so if you have an issue with your Android device, simply fill in the short questionnaire in this link and we will try to publish our answers in the next posts. We cannot guarantee a quick response so if your issue is time sensitive, please find another way to resolve your problem. 

If you find this post helpful, please help us by spreading the word to your friends. TheDroidGuy has social network presence as well so you may want to interact with our community in our Facebook and Google+ pages.