Galaxy S7 SD card not detected, keeps getting pop ups, other issues

Hi guys! Here’s our last #GalaxyS7 post for the week. We hope you’ll enjoy reading the issues and their respective solutions.

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.

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 purchased in the US not working in India

Hi All. I am having two problems. i hope if you guys can help me out.

1) I bought one Samsung Galaxy S7 edge phone and I have been told that this phone is factory unlocked worldwide. I bought it in the US and mailed it to India. When my brother inserted a SIM on it, no signal show up. Then I told him to reset, changes settings in Network but no luck. Then finally he reset it to factory unlock.

2) After factory reset still have same issue. No signal coming on phone but now when I restart my phone I am seeing Android logo on screen where as I should see SAMSUNG logo while starting up phone. Does this means my phone is not genuine as I am not seeing SAMSUNG logo or is there anything I have to do to change it. — Mukesh

Solution: Hi Mukesh. There are a couple of things to consider if you want to go to the bottom of the issue.

CDMA vs GSM. This is the first thing that you must consider when planning on using a phone to another network. CDMA (Code Division Multiple Access) and GSM (Global System for Mobiles) are two of the most common wireless technology that most carriers around the world are using. CDMA is not compatible with GSM and vice versa. Needless to say, the difference between them is usually the main reason why phones won’t work in another network. For example, in the US, Verizon phones usually won’t work at all, or may have some limitations when used in a GSM network like AT&T. Verizon uses CDMA while AT&T GSM. Because a CDMA phone is built differently than a GSM phone, even though they’re of the same model, you’ll still encounter incompatibility issues. The same can be true in your brother’s case. If the phone you gave him was CDMA and he’s on a GSM network, there’s no way that phone will work.

We know you were told the phone was unlocked but most of the time, it doesn’t work at all. Unlocking a phone only changes some software settings, particularly on the network function, but the hardware remains the same. A network unlocked CDMA phone may or may not work properly when used in a GSM network.

CDMA phones are more restricted than GSM phones. GSM phones store subscriber information in SIM cards so as long as it’s properly network unlocked, you can easily use another SIM card from another network and it should work. CDMA phones don’t work like that because subscriber’s information is coded deep within the software. CDMA phones may sport a SIM card slot but that doesn’t work like a GSM phone does. The SIM card is there to allow a CDMA phone to use 4G LTE, which is just a modified GSM technology. CDMA phones still need to dig deep into each software everytime a user want to make a call or send SMS. Needless to say, CDMA phones are usually locked to its original carrier.

Giving you more details about this topic is beyond the scope of this article so we recommend that you do your own research about it.

We know nothing about your brother’s phone but if you want to know if it’s a CDMA or GSM phone, simply do a quick Google search for its model number.

Different frequencies. Samsung build phones with a specific carrier in mind so it’s not uncommon to find a Galaxy phone model having many variations. For example, hardware specifications of Verizon is different from hardware specifications of AT&T phones. This means that even if both phones look the same outside, their hardware differ significantly inside. One of the significant differences can be the operating frequencies. Each carrier works in a certain radio frequency to avoid interference so each of their phones must be provided with compatible networking chip so they can operate properly. If the frequency of the phone is different from the frequency of your brother’s carrier, the phone can’t simply find the signal. Unfortunately, there’s nothing much that you can do about that since frequency capability is determined by the hardware installed. You cannot remove the networking chip from a phone and replace it with a different one. Again, we recommend that you do some research about this topic if you want to know the cause of the problem. Have your brother contact his carrier to ask for help regarding this matter.

Problem 2: Galaxy S7 not receiving SMS from iPhones and My Sprint app not working

Hi. I was recently at a Doctor’s appointment and logged onto their Wi-Fi. Since I returned home I cannot receive any texts from anyone with an iPhone. Also “My Sprint” is not working at all and my Google voice is not allowing texts to come through my normal messaging app.

All of my updates are complete and I tried to reboot my phone and also went into wifi and clicked on the Doctor’s office wifi and said to “forget” it but still nothing.

Please advise as I am literally having the day from hell between my phone an ld my druer being broken. Thank you. — Tlynalu

Solution: Hi Tlynalu. We can’t see any reason why SMS would stop working after using a different wifi network. Something must have changed in your phone’s networking settings to cause the problem. We’re not familiar with your phone, nor did you provide more information to help us identify the cause. We recommend that you contact your carrier for assistance.

Problem 3: Galaxy S7 stuck in Sprint logo screen after deleting files

I have the Samsung S7. Last night, I did a clean up of cache and old pictures. This evening i used my phone till it died. I charged it and turned it on upon 100%, however the screen locks at the Sprint flash logo screen. It stays on the screen and makes the battery hot. What is going on with my phone? Please help, i have tons of valuable pictures that i would hate to lose. — Rookie704

Solution: Hi Rookie704. We don’t think you only deleted cache and pictures. If you are 100% positive that all you did differently before noticing the issue was to delete some stuff, you must have deleted some critical files or folders that caused this problem. If your phone won’t restart normally now, you don’t have a lot of options.

Try to boot the phone to Recovery mode first and see if you can fix the problem by wiping the cache partition. If cache partition wipe won’t solve the issue, you should try a factory reset. That will delete your data of course but as we’ve said, you really have not much choice.

Here are the steps on how to start the phone to Recovery mode:

  1. Charge the phone for at least 30 minutes.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy logo 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 cache partition.’
  6. You can either wipe the cache partition or do a factory reset when in this mode.

Problem 4: Galaxy S7 edge screen showing red and green dots after an update

On 14th June i downloaded the latest android version in my S7 edge and leave it to install over night. And when i wake up i start watching some videos, then i noticed there are some green and red dots on the screen. So i locked the device and reopened it. the dots are gone but after half a minutes the screen turns green and start flashing. At first i thought somehow i break the display or might some water in gone inside it though the mobile is water proof. i tried to restart it but i can’t because i can’t see any thing. But after some while it turn backs to normal but the dots and green screen still flashes from time to time jut for a blink. — Hamza

Solution: Hi Hamza. Try to wipe the cache partition first. If nothing changes, do a factory reset. Below are the steps on how to do each of them:

How to wipe S7 edge cache partition

Turn off your Samsung Galaxy S7.

Press and then hold the Home and Volume UP keys, then press and hold the Power key.

When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.

When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.

Using the Volume Down key, navigate through the options and highlight ‘wipe cache partition.’

Once highlighted, you may press the Power key to select it.

Now highlight the option ‘Yes’ using the Volume Down key and press the Power button to select it.

Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.

The phone will now reboot longer than usual.

How to factory reset an S7 edge

  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 5: Galaxy S7 screen is black after water damage

My S7 edge which I bought a month ago fell in water. The screen blacked out and only blue light was showing. However I can feel and hear sounds coming from the device even though it’s black. I tried to reboot through various steps. at last I went to the place where I bought the phone. They opened it and found out that water has sipped in from SIM card sections and told me I have to change the screen but they don’t guarantee it will work. I’m confused, if i buy a new LCD screen will it work? Please assist. — Shanit

Solution: Hi Shanit. When it comes to water damage, no repair is guaranteed. There’s no way to know in advance if the current issue can be fixed by replacing a single component — the screen assembly. Water can damage other components in the motherboard and screen replacement may fix the black screen issue but the phone may work erratically in the near future, especially if there’s corrosion in the motherboard. The best thing that you can do is to let the device be checked by a good technician so you can get an honest assessment. If they’ll say that repair may not guarantee that the phone will work afterwards, you are better off getting a new phone. We know that option can be difficult but again, there’s no telling what components are damaged right now.

Problem 6: Galaxy S7 messaging app issue

I am using the message app that came with my Samsung Galaxy S7. I am having an issue with the message display screen that shows different people that I have texted. One time I can turn on my phone and the last message displayed will be what I sent to someone, but I have to select the person/conversation and open it to see their response. The next time it might show their response to a message two days ago, but not the message that I sent this morning without selecting the conversation and opening it. I would like it to always show the last communication in the response – whether it is me or the person that I am talking to. Any suggestions? I have rebooted it, but I can’t take the back off of this phone. — Tonnette

Solution: Hi Tonnette. We don’t think we understand what you’re trying to accomplish here but if you’re having trouble with one app, you can always try wiping its cache first, then its data later. Keep in mind though that clearing your messaging app’s data will erase your SMS conversations. If you don’t want to lose your SMS, try backing them up first using Samsung Smart Switch app.

Below are the steps on how to clear an app’s cache and data

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

Problem 7: Galaxy S7 keeps saying SMS sending failed

My wife and I have S7s that just received the Android 7 update (hers a few days ago and mine a few hours ago). Since her update (and now mine) we both have the same experience with SMS/MMS messages. We get an error that the text failed, BUT it actually goes through! She did a factory reset last night and it did not correct the problem. We installed a new messaging app on her phone and it did not help. I reset the settings on my phone and no help. Any ideas? — Bigelot

Solution: Hi Bigelot. It can be an operating system-related issue. This means that the firmware update you installed (which was provided by or modified by your carrier) is poorly coded. Make sure to report the trouble to your carrier so they can look into it.

Problem 8: Galaxy S7 no notifications for MMS

My phone randomly stopped notifying me that I received group text messages. I went to investigate the problem and when I go to messaging settings>more settings>multimedia messages> turn on auto retrieve and roaming auto retrieve it then notifies me when I get a group text. BUT it notifies me as an individual message and I have to download each person’s response individually. It then adds the message to the group message. It’s extremely annoying and hope you can help me fix it. Thanks! — Courtney

Solution: Hi Courtney. Try wiping the messaging app’s cache and data first and see how it works. If nothing will change, do a factory reset. Refer to the steps above on how to do each of them.

Problem 9: Galaxy S7 SD card not detected, keeps getting pop ups

Hello. Yesterday my 32GB SD card disappeared and will not show in my file as being inserted even though it’s still in my phone. Today I took it out and put it in my Samsung tablet and it was not recognized as being inserted in there either. The only thing i have not did yet was put it in a card reader and insert it in a laptop. That’s my next move. My question is what did this? All i did was restart my phone because it said that i have not done so in a few days. I have done this a lot and I’m not 100% sure if the SD card was done before or did that but I’m pretty sure that it was. Im sick i have lost a lot of great music and no it was not backed up. At one point it was but someone stole my flash drive It was on. Is there any way to retrieve what’s on this SD card?

Also for about 2 months I keep getting a pop-up or something like that on my S7. It’s annoying. Is there a way I can get rid of it? When I went to the T-Mobile store they told me no. Hope to hear from you soon thanks. — Tamar

Solution: Hi Tamar. As we’ve always stressed in a lot of our articles, digital storage devices like SD cards are unreliable. They can die anytime without leaving a trace on what may have caused them to stop working all of a sudden. To discuss the entire gamut of possible causes on why an SD card dies is beyond the scope of this article but you can always Google it if you have the time. Knowing what caused your particular SD card to die is impossible so it’s best if you can leave it that way.

We want to give you some useful tips though on how to minimize this issue from happening again. Here are a couple of them:

  1. Avoid interrupting the system or device (by turning it off) when it’s trying to read from or save to the SD card. Some apps can be saved in an SD card and if you turn off your phone while an app is loading, it can corrupt the SD card. The same is true when the phone is trying to move files to and from the card.
  2. Unmount the SD card properly before physically removing it. You can do that by going under Settings>Device maintenance>Storage.

You can also visit our previously published post for more tips on this topic.

For the pop up issue, the answer really depends on what type of popups you’re getting. If they are ads or something that promotes a product or another app, your phone is probably infected with a virus so you would want to factory reset it first. After that, you want to make sure that you only install apps from trusted sources. Viruses in Android mostly come from bad apps so you only have yourself to blame if you don’t filter apps you install.

If you’re getting system notifications, you may be able to fix the problem by tweaking some of your settings. Next time you contact any support team, always provide as many details as possible. In this case, it would have helped us a lot if you included more details about the pop up, or provided more descriptions about it. You can’t expect us to help you if you give us anemic description of your problem.


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