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How to set up Galaxy S8+ screen lock, can’t send MMS, reboots randomly, other issues

We are now receiving a steady trickle of reported #GalaxyS8 and #GalaxyS8+ issues so here are some of the first ones that we address so far. Be sure to also visit our main Galaxy S8 troubleshooting page by following this link.

Below are the specific topics we discuss in this material:

  1. Cannot send SMS on Galaxy S8
  2. Galaxy S8 not detecting an SD card
  3. How to assign Contacts group ringtone in Galaxy S8
  4. Galaxy S8+ reboots randomly
  5. Galaxy S8+ can’t send MMS
  6. Galaxy S8+ People Edge screen call setup
  7. Galaxy S8+ screen won’t lock | How to set up Galaxy S8+ screen lock
  8. Verizon Galaxy S8+ takes 30 minutes to restart
  9. Galaxy S8 screen won’t respond | Galaxy S8 won’t turn off

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: Cannot send SMS on Galaxy S8

I have a Samsung Galaxy S8 phone with Consumer Cellular service (via) AT&T. My phone is not able to send text messages. I’ve tried settings recommended to no avail. My last phone an S6 had the same problem. Any help would be appreciated. Thank you! — Rena

Solution: Hi Rena. If you’re using the same SIM card or the same number on both your S6 and S8, it’s highly possible that the cause of the issue is account related. Instead of looking for ways to troubleshoot your device, we strongly suggest that you contact your carrier instead and let them handle the situation. Whether our assumption is correct or not, it’s their primary responsibility to help you fix this problem so contacting them is your first priority.

Problem #2: Galaxy S8 not detecting an SD card

My phone at first recognized my 128GB SD card. Now it doesn’t. It just stopped. Popping it out and back in doesn’t help. It’s like it’s not there at all and I can’t figure out how to get it to be recognized reliably. The card doesn’t show up in any place where the phone would show one, storage, my files etc. — Akaplan.nj

Solution: Hi Akaplan.nj. The first thing that you want to do is to check whether this is an SD card issue or not. Try to insert the SD card to another device and see if it’s detected. If it’s not, try to reformat it and insert it again. If the second device won’t detect it afterwards, get another SD card.

On the other hand, if a second device will detect the SD card and will work normally in it, there must be an issue with your phone. DO a factory reset and see if it detects the SD card. If it doesn’t detect it still, send it in for repair or replacement.

Below are the steps on how to factory reset your Galaxy S8:

  1. Back up data on the internal memory. If you have signed into a Google account on the device, you have activated Anti-theft and will need your Google credentials to finish the Master reset.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  4. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  5. Press the Volume down key several times to highlight “wipe data / factory reset.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, “Reboot system now” is highlighted.
  10. Press the Power key to restart the device.

Problem #3: How to assign Contacts group ringtone in Galaxy S8

On previous Galaxy S5, under Contacts and groups, under edit groups you could assign a ringtone AND a message tone to each group. On the S8, I only see a ringtone option.. Any suggestions or workarounds to assign a different message tone to each group? — Dave

Solution: Hi Dave. To assign a Contacts group ringtone, follow the following steps:

  1. Open the Contacts app.
  2. Tap More settings icon at the upper-right hand side (three-dot icon).
  3. Tap Groups.
  4. Tap the group you want to edit.
  5. Tap EDIT at the top.
  6. Tap Group ringtone to assign a ringtone.

NOTE: The steps above are applicable for Samsung Galaxy devices running Android Nougat (Android 7).

Problem #4: Galaxy S8+ reboots randomly

My Samsung Galaxy S8+ is randomly powering off and booting back up, and it will do it in the middle of talking on the phone, listening to music, or if I play a game. And I’ve to look up to see if there was a quick easy fix and I don’t see one. So if someone could get back with me to resolve this, I would appreciate it a lot. Thanks. —  James

Solution: Hi James. An issue like this can be caused by either a software glitch, an app bug, or bad hardware so your main task is to narrow down the possible causes first. To do that, you want to perform basic software troubleshooting.

First, you want to wipe the cache partition. This will ensure that the system cache is not corrupted. Here’s how:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight “wipe data / factory reset.”
  5. Press Power button to select.
  6. Press the Volume down key to highlight “wipe cache partition.”
  7. Press the Power key to select.
  8. Press the Volume down key to highlight “yes” and press the Power key to select.
  9. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  10. Press the Power key to restart the device.

After wiping the cache partition, try to observe the phone again for at least 24 hours to see if the problem returns. If it does, your next step is to determine if a third party app is to blame. To do that, try booting the phone to safe mode and observe it for a day. Follow these steps:

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.
  8. Observe the phone in safe mode for at least a full day.

Safe mode blocks third party apps and services so if the issue won’t occur during this time, that’s a confirmation of our hunch that a third party app is to blame. You must uninstall apps until the issue is eliminated.

Finally, if all else fail, do a factory reset. This is the last troubleshooting step that you can do. If the issue stays, send the phone for repair or replacement.

Problem #5: Galaxy S8+ can’t send MMS

I just received the new Galaxy S8+ on Wednesday and had everything from my S6 transferred over to the S8. I was able to send and receive text messages but was unable to send or receive images. Nothing I tried seemed to work. I contacted Verizon and they couldn’t figure it out either. I changed your app settings for APN to manual and entered 80 for port number. That didn’t solve the issue. However, I did change from legacy to system and it worked, sort of. I was able to receive MMS but I couldn’t send MMS. I finally gave up and went back to Go SMS which I hate, but they do offer GIF (people sent me little GIF in messages but they don’t play); try adding that feature soon. The APN settings for the phone itself cannot be changed or a new APN (Add) cannot be created. — Rickydeansd

Solution: Hi Rickydeansd. There are a number of possible causes for this issue but we recommend that you work with your carrier in solving it and not to rely on third party support teams like us. There’s only so much that we can do, especially that you did not provide any helpful information about your phone and account. Telling us you’re having a problem does not give us any clue at all.

If your phone was built for a different carrier and not for Verizon, there may be some software restriction causing the problem so you must do your own research by going to forums of your old carrier to see if others are experiencing the same issue. A lot of people discover answers this way so try to exhaust everything if your current carrier can’t help you at all. Keep in mind that Samsung only provides the hardware to these carriers. Software running on these devices are supplied by their respective carriers so each one can run a significantly different coded Android. For example, T-Mobile uses its own software for its Galaxy S8 so if you use this phone in Verizon network, you can always expect that some services may not work at all.

How to wipe messaging app’s cache and data on Galaxy S8 and S8+

Another possible reason why you are unable to send MMS is the huge number of messages in your messaging inbox or sent items. Try to wipe the messaging app’s cache and data before attempting to send another MMS and see how it works. Here’s how to do that:

  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 6.0.
  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. These are all clickable items. You’ll want to click on Storage.
  5. You should now clearly see the Clear Data and Clear Cache buttons for the application.

Sometimes, MMS problems can arise if you are also experiencing mobile data connection problems. Make sure that you have a good internet connection (not wifi) when trying to send an MMS and see it works. If it continues to fail even if mobile data is working fine on your phone, take note of the error message or the behavior of the messaging app contact your carrier. Be sure to mention whatever error you may be getting to your carrier as that may help them identify the issue faster.

Also, make sure that you let them check if there are any account-related factors that may prevent you from sending MMS. They may not have configured or provisioned your account properly at this time.

Of course, troubleshooting with them implies that they check all device settings (network settings) in order for MMS to work. It’s their primary job in the first place to make sure that their services are working properly on their subscriber’s devices.

Problem #6: Galaxy S8+ People Edge screen call setup

On the Galaxy S8+ People Edge screen, when I set it up, I accidentally set the option to either call or message when I tap on a contact. This causes it to be a two tap process instead of just tap and call. I can’t figure out how to change it back so that when I tap on a person it just makes the call. Any help you can give would be greatly appreciated. I need to get rid of the message option to speed things up! — Marc

Solution: Hi Marc. We can’t find any option to revert your S8’s People Edge app to your previous configuration. We don’t think there is such an option even. In our own Galaxy S8, it’s always a two-tap process (first you have to tap the contact, then tap either the phone icon or message icon). If you are positive that yours had a more efficient method, we suggest that you wipe People Edge app’s cache and data. 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 6.0.
  3. Tap the more options icon on the top right (the three-dot icon).
  4. Tap Show system apps.
  5. Find People Edge and tap it.
  6. You’ll now see a list of stuff that gives you information about the app, including Storage, Permissions, Memory Use, and more. These are all clickable items. You’ll want to click on Storage.
  7. You should now clearly see the Clear Data and Clear Cache buttons for the application.

If wiping People Edge app’s data won’t help, do a factory reset.

Problem #7: Galaxy S8+ screen won’t lock | How to set up Galaxy S8+ screen lock

I have an issue with locking my Galaxy S8 plus. I’ve tried fingerprint, face recognition and PIN number and still someone can gain access to my phone. On the ‘always on’ screen, once I’ve locked out of my phone, there is the ‘home’ button present. If I double tap this my locked screen shows with an unlocked padlock showing. Underneath this it states ‘swipe screen to unlock’. I do this and it opens up my phone! I’ve asked a friend to do this for me and they gained access to my phone too! If I tap the ‘unlocked padlock’ the device becomes locked and I need to enter my pin, pattern or whatever security measure I’ve set up. This ONLY happens when I tap the ‘unlocked padlock’. If I don’t do this, and simply swipe the screen, I gain access to the phone. Is this a known problem? Or am I doing something wrong? Regards. — Neil

Solution: Hi Neil. We don’t think you set your phone’s screen lock properly so here’s how to do it.

  1. Open Settings app.
  2. Scroll down and find Lock screen and security.
  3. Tap Lock screen and security.
  4. Under Screen lock type, configure the lock type of your choosing.
  5. Once you’ve configured the lock type you want, go back to Lock screen and security menu and tap Secure lock settings.
  6. In here, you can either choose Lock automatically option or Lock instantly with power key option. We recommend that you pick Lock instantly with power key so you can manually lock the screen by pressing the power key anytime.

NOTE: If you previously enabled Smart Lock, that may be the reason why your screen did not lock at all. If you need to secure your phone more often, simply disable Smart Lock.

 Problem #8: Verizon Galaxy S8+ takes 30 minutes to restart

Hi there! So here’s my question/concern. I have a Samsung S8 plus (Verizon) and i recently restarted my phone (no reason, just wanted to restart it) and it took 30 minutes for it to boot up!!! I thought maybe it had something to do with encryption, but I’ve looked and none of my settings are set for that.

Tonight, I decided to restart it again, and as I’m typing this, it has been 25 minutes and still booting up. The first restart the screen was stuck on the basic screen with the wheel turning. This second time, it’s stuck on the Verizon splash page and the 4 dots are blinking in sequence.

The only thing I’m running on my phone that isn’t stock is Nova Launcher…but I have zero issues with the phone when it’s on and running.

My concern is if I’m out and about and my battery dies, or if by some chance my phone decides to restart and there is an emergency i’ll have to wait 30+ minutes before I can access my phone again!!

Once it comes back on, i will remove the SD card and try it again…just before i go to bed. I’ve searched the interwebs and haven’t come across anyone else with this issue.. Help please!!!!! — Brett

Solution: Hi Brett. It’s only been weeks since the Galaxy S8 and S8+ were released so we are not sure if other users are experiencing the same problem (which may suggest a Samsung issue), or if it’s only happening on select Verizon users (which in this case can mean a possible Verizon firmware problem) only. We suggest that you contact Verizon about it so they can keep an eye for this particular bug. We have an international Galaxy S8 and it doesn’t do this so there’s a chance that this is a Verizon bug.

If you have the time, consider wiping the phone by doing a factory reset and see how it works afterwards. If the problem persists, have it replaced with a new one.

Problem #9: Galaxy S8 screen won’t respond | Galaxy S8 won’t turn off

I cannot get the phone to respond and do anything. It turns on, but the swipe screen to open the phone will not respond. I have tried to open the phone in safe mode, but I cannot power off the phone at all. I was able to restart it using the down volume and power button but that’s it. I cannot turn off the device or get to the screen to clear the cache….HELP. — Laura

Solution: Hi Laura. Looks like you have no other choice here but a factory reset via Recovery mode. Try the steps below. If the phone’s screen remains unresponsive, contact Samsung or your carrier for repair or replacement.

  1. Back up data on the internal memory. If you have signed into a Google account on the device, you have activated Anti-theft and will need your Google credentials to finish the Master reset.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  4. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  5. Press the Volume down key several times to highlight “wipe data / factory reset.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, “Reboot system now” is highlighted.
  10. Press the Power key to restart the device.

 


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  1. Hi I pre-ordered the Galaxy S8 plus set up the fingerprint lock screen and forgot the pin, and on 4/28/17 T-MOBILE sent out an update after the update was complete it restarted the phone. Since then I have been locked out of my new $922.00 phone. I can’t turn phone off to do a factory reset as the button combination on the side only take me to the turn off screen which also ask me for a pin number to turn phone off. Have spoke with T-MOBILE and Samsung no one can help.

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