Galaxy S6 can’t make/receive calls, MMS stops working randomly, other issues

Our #GalaxyS6 article for the day covers three issues about SMS, MMS, voice calling, and a unique sound problem. We’ll continue posting more of the same issues in the near future so if you did send us a request for help but are yet to see them published, please continue watching for more upcoming articles.

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 S6 can’t make/receive calls

Thanks for giving me the chance to ask for your help. I have a Samsung Galaxy S6 which I bought in the States. I brought it to the US and have been using it for a year just fine after the phone company techs programmed it to work on their system. Saturday, all of a sudden it switched the network mode setting from LTE/CDMA to Global and this caused my data to stop working. After being without internet for 24 hours the phone company tech figured out what was wrong and changed the setting back. Now, today phone calls don’t work. When I dial out it just says “no sim or sim error” and then closes the call without even ringing. My friend tried to call me and it went straight to voice mail saying my number was unavailable. I’ve tried all the things you suggested on your page ( and none of them have helped. Any other suggestions before buying a new sim card or a new phone? — Emilysaylor2

Solution: Hi Emilysaylor2. The suggestions in this troubleshooting article are all very basic steps that a user must try on his or her end. In a lot of similar cases though, the problem lies deep within root level so unless you work for your carrier and know exactly what specific stuff to modify, there’s really nothing much that you can do. Third party support group like us don’t know everything as network-specific codes are proprietary and sometimes guarded secret by companies themselves (for security reasons). We also don’t know what software changes were made to make your device compatible with your current carrier so whether you like it or not, your only option at this time is to ask support from your carrier.

To prevent losing software modifications in the future after your carrier has set the phone up again, be sure to disable automatic system update option. Also, try to avoid doing a factory reset or any system-wide software modifications as some network codes may change after that. One of the downsides of using a phone from another carrier is the fact that it can sometimes be a pain if you want to impose system changes like update to the latest Android version or modigy root files. You just have to accept the fact that you’ll have limited freedom in your phone in this situation. We don’t know what really happened why your phone suddenly stopped working in your current network so we can’t tell for sure if it’s due to something you did or not. The rule is, once your carrier has set the phone up again, don’t even think about updating or making Android changes. Just stick to what you’ll have and just forget about the new things that come with recent Android versions.

Problem 2: Galaxy S6 making screeching alarm type siren sound

Hello. I have a Samsung Galaxy S6 that has sound problems. Both speakers make a screeching alarm type siren sound. Very loud and irritating. It happens on start up and on test *#7353#.

I have started the phone in Safe Mode and sometimes the same problem occurs. I have carried out a hard reset to return to factory settings and at first it is ok. But then a little while later I get the same screeching noise or no sound at all. It takes 3 hard resets to get rid of the problem but after a while it keeps coming back. I have carried out another hard reset but this time I have NOT connected to the internet to install/ download updates etc and at the moment there is no sound problem. Logically thinking it seems to me that there is no hardware problem and therefore a software problem. I really like the phone and it is just right for my personal needs so therefore I do not want to buy a new phone. I hope you can assist me and I look forward to hearing from you soonest. Regards. —  Danny Tom

Solution: Hi Danny. We can’t imagine what exactly you mean by “screeching alarm type siren sound” but if this sound isn’t part of the normal audio package of a Samsung phone (which means that it’s probably added by another app), you should really consider the possibility that one of your apps is causing it. Do another round of factory reset via Recovery mode (steps provided below)and observe the phone for a day or two when there are no third party apps installed. The aim for this step is to see if there’s any difference when the phone runs a clean software version. Some bad apps can continue to run even when the phone is booted to safe mode so, at times, wiping the phone clean is the best way to go. For reference, these are the steps on how to factory reset your phone via Recovery Mode (if you’ve only tried a factory reset via Settings):

  1. Create a backup of your important files such as photos, videos, etc.
  2. Turn off your Samsung Galaxy S6 Edge.
  3. Press and hold the Volume Up, Home and Power keys together.
  4. When the device powers on and displays ‘Power on logo’, release all keys and the Android icon will appear on the screen.
  5. Wait until the Android Recovery Screen appears after about 30 seconds.
  6. Using the Volume Down key, highlight the option, ‘wipe data/factory reset’ and press the Power key to select it.
  7. 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.
  8. After the reset is complete, highlight ‘Reboot system now’ and hit the Power key to restart the phone.
  9. Set the phone up again.
  10. Observe the phone for a day or two before installing anything.

If you are fond of installing apps without checking if the source/developer can be trusted, there’s a chance this is a product of problematic or even compromised app. If you think this is the case, use elimination method to pinpoint the bad app.

Problem 3: Galaxy S6 can’t send or receive SMS, MMS stops working randomly

Hi. I have a Galaxy S5 and cannot send or recieve texts. I can send a text adding a subject or pic to a few contacts but not all and can’t send regular text or receive any at all. I’ve tried calling straight talk and they called verizon and said everything is fine on both ends. I’ve also tried factory reset and they even sent me a new phone and it’s doing the same thing!

Could it be something with my Google or samsung account. I was going to try and make a new google account to set it up but it won’t let me now. Can you please help me? I’m at a loss on what to do.

I’ve tried all your trouble shooting solutions except checking the message center number. I cannot find that in my setting so I’m assuming with StraightTalk, I don’t have the option to check or change that. My only thought is it’s something with account because I got a text from Straight Talk when I set up my phone but when it synced my contacts and everything I couldn’t do anything again. I hope you can help! — Angie

Solutin: Hi Angie. Your Samsung or Google accounts have nothing to do with this problem. Whether you’ve added any/both of them or not, SMS, MMS, and voice calling should still work in your phone. That it doesn’t is a clear sign that this may be an account issue. You mentioned that you sending MMS sometimes work so it can also be a network problem. Unfortunately, you really have to work with your carrier on how to fix the problem. There’s nothing much that we can do in this case.

Also, it’s very unusual for your device not to let you edit the Message Center Number. This number can be edited as it changes depending on the network you’re on. In most cases, inserting a SIM card from a compatible carrier (and if you’re in a GSM network), automatically changes the required Message Center Number. To edit it, you must do the following:

  1. Open the messaging app you’re using (we assume it’s the default stock Samsung Messages app).
  2. Tap More icon at the upper right hand side.
  3. Tap Settings.
  4. Tap More settings.
  5. Tap Text messages.
  6. Tap Message Center.

If you can’t access Message Center Number via the steps above, there must be something wrong with the software. Turn off the phone, remove the SIM card, re-insert it, then check again. If you have a CDMA phone (you mentioned Verizon which is a CDMA network) and the Message Center Number (MCN) can’t be accessed after a restart, the current software must be preventing you from doing so. You should talk to StraightTalk on how to access MCN, or if there’s another way to make SMS and MMS work normally again.

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