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S7 no mobile data on 3G network

Galaxy S7 mobile data won’t work during calls, 4G LTE won’t work, “out of service range” error during calls, other issues

Hello guys! Here’s another article about the #GalaxyS7. Today we bring you solutions about some networking issues some users have encountered on their S7 devices. We hope you’ll find this article a good read.

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 won’t connect to wifi

Hi. I have a Galaxy S7 and I cannot connect to open WiFi that has a login page. I will select the WiFi, try to go to the Internet page to log in, but it will just show me the Chrome homepage and no log in screen. Please help. — Grace

Solution: Hi Grace. Is the phone having trouble connecting to all wifi networks with and without a login page? If you haven’t checked, make sure that you do this as the first troubleshooting step. Try going to a friend’s place and connect to their wifi network or you can visit public places with free wifi to test this out. If the problem only occurs to one wifi network, then the problem is most probably authentication-related. This means that the main reason why your S7 is not connecting is due to the fact that you’re not entering the correct SSID and/or password. To fix it, make sure that you put in the right password after picking the right network name.

If your S7 is having trouble connecting to multiple wifi networks, that suggests an issue with the phone itself. To fix the problem, you must first try to boot the phone to safe mode. This will let you know if a third party app is causing the trouble. While in safe mode, all third party apps and services will be blocked. Thus, if the issue won’t occur and wifi works normally, that’s an indication one of the apps is to blame.

To boot your phone to safe mode, follow these steps:

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

If the problem won’t go away even when you’ve already restarted the device to safe mode, the next logical step is to perform a factory reset. Doing so will address problems associated with the operating system. Here’s how it’s done:

  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.

Remember, factory reset will erase all user data including photos, videos, etc. Be sure to create a backup before a factory reset.

Problem 2: Galaxy S7 mobile data won’t work during calls

If I’m on a phone call, I lose all internet service and if I’m on the internet a lot of times calls won’t come through. — Stourdot

Solution: Hi Stourdot. CDMA phones usually makes way for only one type of bandwidth to work. For example, if you’re in a call, a CDMA phone will temporarily disable mobile data connection so that voice calling service will have uninterrupted coverage. This is how it works in this type of phone so you’ll just have to accept it.

This is not true for GSM phones however. Since you did not mention what your carrier is, we suggest that you contact your service provider and see if there’s a way for them to allow both voice calling and mobile data to work at the same time. For instance, Sprint is currently offering their Calling PLUS service to allow calls in their LTE network. This service is only available for select devices though so you’ll have to ask your own carrier if they’re offering similar capability.

Problem 3: Galaxy S7 loses mobile data connection when on 3G network

Hello Guys. I am experiencing some 3G data connectivity issues with my device. Edge works just fine but 3G or H+ hardly ever connects. My SIM card works on other phones and other SIM cards have the same issue on my phone.

I have done several factory resets and also tried some Custom ROMs and different sorts of modem firmware, all to no avail. But I recently noticed something curious. Anytime my signal strength is -65dBm or lower, my H+ works flawlessly. However, from -67dBm and higher, I start to lose the connection. Above -75dBm, my phone loses signal completely and fails to register on the network. The H+ icon remains with the up arrow flashing but the down arrow never comes on. Edge still works fine in both scenarios though painfully slow. My network bars are almost always full. I never get 4G because I’m not in the coverage area, but I don’t bother about that. Please what do you guys think is the problem? — MIC

Solution: Hi MIC. Received Signal Strength Indicator or RSSI is the gauge to use when talking about power levels a radio in a device like your smartphone receives. RSSI is measured in  dBm. The dBm scale being used in smartphones range from -50 and -120, with -50 being the perfect signal and -120 the total loss of signal from the network. Below are the rough estimates of ranges that we can use to explain your case:

-50 to -75 dBm – High Signal

-76 to -90 dBm – Medium Signal

-91 to -100 dBm – Low Signal

-101db to -120 dBm – Poor Signal

That your phone loses signal at around -75dBm is an indicator that there may be a problem with its networking chip. Based on the readings above, having -76dBm and above is still an acceptable signal strength in a normally working device. Since you’ve already tried doing a factory reset and flashing a few ROMs, we’re afraid the only option for you is either repair or replacement. Please contact Samsung so the phone can be fixed.

Problem 4: Galaxy S7 4G LTE won’t work, “out of service range” error during calls

My Galaxy S7 doesn’t get 4G data or any data at all but I have data on my plan with AT&T.  I’ve confirmed this with them. Sometimes it doesn’t even let me call when I have a few bars. When I try to call, it goes to no bars and says ‘out of service range’. When that happens I go to my settings and see if my data is on and it says ‘please insert SIM card’. 4G works maybe 1 day per week though for some reason and everything is okay. I’m wondering if you can help as to whether it would be the sim card reader or the antenna and if it’s possible to determine which on my end somehow? Thanks in advance for any help you can provide. — Noah

Solution: Hi Noah. Since you are on AT&T network, we are assuming that you have a GSM phone. However, if your phone is originally not from AT&T and is a CDMA version, like devices from Verizon or Sprint, this can be the reason why mobile data stops working. As mentioned above, CDMA devices doesn’t allow voice calling and mobile data simultaneously.

If, on the other hand, the problem occurs when you have an AT&T device, which is a GSM phone, this can mean other things. For one, it can be due to an unknown cache-related issue. To try and fix it, you should do a cache partition wipe. Here’s how:

  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 cache partition.’
  6. Once highlighted, you may press the Power key to select it.
  7. Now highlight the option ‘Yes’ 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.

If a cache partition wipe won’t help, you can then proceed to observe how the phone works when it’s on safe mode. It’s possible that a problematic app may be affecting some networking functions of your device. To see if that’s the case, you should observe how your phone works while it’s on safe mode. If you haven’t done this before, refer to the steps above.

An important troubleshooting step and possible solution in this case is factory reset. If a cache partition wipe and restart to safe mode have already been tried, you should consider a factory reset. It’s the most that you can do in this situation.

If all our suggestions have already been exhausted, that means that the problem is outside the device itself. Make sure to contact AT&T so they can help you narrow down possible causes. There may be an on-going network problem causing poor service in your area so all you have to do is to wait until it’s addressed.

 


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