Sprint Galaxy S6 not working on AT&T network, other connectivity issues

S6 in car

Connection troubles on the #Samsung #GalaxyS6 series are some of the common problems encountered by some members of our community. In this post, we discuss at least 4 different connection problems shared by some of our readers.

  1. Sprint Galaxy S6 not working on AT&T network
  2. Galaxy S6 school Wi-Fi problem
  3. Galaxy S6 keeps saying maximum number of tabs has been reached
  4. Galaxy S6 Bluetooth crashes if A2DP is enabled

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.


Problem #1: Sprint Galaxy S6 not working on AT&T network

First it is my wife’s phone, which she loves.  She was on the Sprint network through her employer. She needed to get her own provider so she wanted to come onto my account, which is AT&T. Sprint has “unlocked” the phone and we have since added the AT&T SIM card and necessary calls for adding the phone/SIM card to AT&T. Since then we have not been able to get her phone on the AT&T network. 

We’ve tried new SIM cards, switching to the GSM network in the phone and we are still have no luck.  We’ve made calls to both Sprint and AT&T and we get the cookie cutter canned responses and passed off to the next tech.

Everytime I try to manually add AT&T under available networks it eventually tells me that the “selected network (AT&T) isn’t available, try again later”.

 I am coming to you as I see by reading your posts that you are extremely knowledgeable on these devices and willing to assist the masses.  We are also getting the “Invalid SIM Card” banner as well on her home screen. I even tried a back-up and factory reset and it still won’t get onto AT&T. Thank you in advance for any assistance. — Jon

Solution: Hi Jon. The reason why your wife’s S6 is not working on AT&T is not due to a phone defect but rather on compatibility issue. As you can see, Sprint uses CDMA technology while AT&T GSM. Needless to say, these two technologies are incompatible with each other. We think that although Sprint has done a domestic SIM unlock (DSU)  on your wife’s S6, which means that they have removed their programming restrictions, there’s no guarantee that said device will work on a competitor’s network. As far as we know, Sprint unlocked phones are not fully compatible with AT&T’s 4G and 4G LTE networks. Compatibility is determined by AT&T’s network technology in one area. There’s a chance that your place is not covered by compatible AT&T network band. Please work with Sprint and AT&T to get proper support and information regarding this compatibility issue.

For more information about Sprint unlocking policy, please visit their website.

Problem #2: Galaxy S6 school Wi-Fi problem

I am using my college Wi-Fi and for the first month it worked perfectly fine. Now when I use it, my phone doesn’t bring up notifications until I open into the app and realize i have a message/notification. It usually happens with social media apps like Groupme, SnapChat, YikYak, and a few others. It works for Facebook, and Chrome and everything else works fine.

I also realized that all apps and notifications work on 4G and other Wi-Fi besides my college Wi-Fi. My college Wi-Fi perfectly works when i put my phone in airplane mode and turn on Wi-Fi and the tech support at school really has no idea what’s wrong even after they went through my settings to see if anything was blocking the connection. I can’t tell if it’s my phone or my schools Wi-Fi at this point if you could help me out that would be highly appreciated. — Michael

Solution: Hi Michael. For an issue like this, we really can’t be certain where the glitch come from. We can only speculate. The best thing that you can do at your end though is to try doing the basic software troubleshooting like wiping the cache partition and factory reset. If you haven’t done them before, just refer to the steps below:

How to wipe the cache partition of Galaxy S6

  • Turn off the device.
  • Press and hold the following three buttons at the same time: Volume Up key, Home key, and Power key.
  • When the phone vibrates, release the Power key but continue to press and hold the Volume Up key and the Home key.
  • When the Android System Recovery screen appears, release the Volume Up and Home keys.
  • Press the Volume Down key to highlight ‘wipe cache partition.’
  • Press the Power key to select.
  • When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
  • Press the Power key to restart the device.

How to perform a factory reset on Galaxy S6

Doing a master reset or factory reset will result to data loss. Make sure to create a backup copy of your personal files (photos, videos, contacts, etc.) before you proceed.

  • Turn off your Samsung Galaxy S6 Edge.
  • Press and hold the Volume Up, Home and Power keys together.
  • When the device powers on and displays ‘Power on logo’, release all keys and the Android icon will appear on the screen.
  • Wait until the Android Recovery Screen appears after about 30 seconds.
  • Using the Volume Down key, highlight the option, ‘wipe data/factory reset’ and press the Power key to select it.
  • 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.
  • After the reset is complete, highlight ‘Reboot system now’ and hit the Power key to restart the phone.

Problem #3: Galaxy S6 keeps saying maximum number of tabs has been reached

Hi there i was wondering if you could help. I have Samsung S6. i use my phone for pretty much everything. however i find this phone for using internet to be a nightmare.

i keep getting a message on my screen when i try to click on links on websites. it tells me to close tabs as maximum number has reached (50). in most cases i have nowhere near 50 tabs open. i close all tabs as instructed and still comes up the same even when i have only one tab.

this drives me crazy. I upgraded from iPhone 5 and i find the S6 to be very frustrating. — Emma

Solution: Hi Emma. Your phone’s internet browser may be damaged or not working properly due to a software glitch. If you are using the stock browser app (the one named “Internet”), you can try deleting its cache and data first to see the difference. Here’s how:

  • Go to Settings.
  • Proceed to Applications.
  • Select Manage Applications.
  • Tap the All tab.
  • Look for the browser app and tap it.
  • From there, you will see the Clear Cache and Clear Data buttons.

If deleting the browser’s cache and data won’t work, try to use a different browser like Google Chrome or Mozilla Firefox for Android. You can also try to do a factory reset (steps provided above) to clean up the phone.

Problem #4: Galaxy S6 Bluetooth crashes if A2DP is enabled

The Bluetooth on my phone crashes the moment the phone connects to my car’s stereo. The car is a brand new, 2016 Volkswagen Jetta Hybrid, and my phone is an S6 running Android 5.0.1.

We’ve only had the car about a month and initially zero issues, but in the last ten days or so the issues started. At first it would crash repeatedly, then finally connect and be fine. Now it just crashes every single time. I turned off the A2DP connection but left the hands free call access on and the crashing stopped. I removed my SD card, thinking that maybe the load of music was too much for the stream but it still crashes over and over as long as the A2DP is enabled.

I ended up factory resetting the phone but it’s still crashing every time A2DP is enabled. My husband has the exact same phone, but he’s not having this issue. For what it’s worth, everything works perfectly fine in my other, older car that has an aftermarket stereo head unit installed.

I’m about ready to throw my phone across the room and pay the deductible to get a new one through the insurance. Any help, at all, would be appreciated at this point. — Serena

Solution: Hi Serana. Since you have already tried to troubleshoot your phone by doing a factory reset, the next step is to troubleshoot your car’s Bluetooth system. Basically, what you want to do is make sure that you delete the old pairing and create a new one. If you don’t know how to do this, please consult your car’s manual or stop by your dealership so they can do it for you.

Deleting and re-creating Bluetooth pairing usually works most of the time in issues such as yours.


See also Solutions for issues between your car Bluetooth system and Android device



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