APN Issues Samsung Galaxy S4 Sprint Rooted - Android Q&A, Help & Troubleshooting

First of all, the APN is greyed out, so I was not able to unlock or do anything with it. So under root browser I went to build.prop and added the two lines at the end:
ril.sales_code=LOL
ro.csc.sales_code=LOL
I rebooted the device and downloaded Change APN and selected my APN and it worked for the night, but then it did not work at all. I undid the cod, rebooted, and did it again. I can add and delete APN's in Change APN, but none of the choices work. I looked online for my provider's APN settings and that did not work at all. I am still using kit kat because I was not able to update. If I update will it fix the issue? And if I update will it get rid of root? I am updating via odin.

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Ok I was able to fix my own issue. Under network mode it is VERY important to have it under CDMA and NOT in LTE/CDMA.

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crmadera said:
Ok I was able to fix my own issue. Under network mode it is VERY important to have it under CDMA and NOT in LTE/CDMA.
Click to expand...
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OK so I did get it to work but what I noticed was that I only get 3G not 4GLTE like I used to. I went in to Change APN and hit menu and clicked on revert to default and that did the trick. I selected the APN called LTE Sprint OTA, went in to my settings and set the network mode to CDMA and it seems like it got 3G when I reboot. The problem now is that there is no APN selected when I turn on Change APN. I do not know what to do to get 4GLTE back. I know at least I got my internet back though. For those with similar issues I will try to find a way and research more, but I do not know for now. If someone does know a way please post it.

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So today I am updating my phone using odin. I currently have 4.4.2, and I will be updating to 5.0.1 (from kitkat to lollipop). I am hoping that works. I backed up all of my stuff on Titanium Backup. I purchased something from it I forgot if it was like a special key or something but I know I have complete access to it from a while ago.
I went to sammobile.com/firmware and looked up for the one that I wanted -mine is SPH-L720. I am upgrading to the most current one that they had. Another thing I noticed too is that you have to register in order to download and the download takes forever. That is no fun at all. But right now I am at 1.0 GB of 1.4 so I will post what happens at 1.4 when I install odin -again- and when I try updating.
I also have bricked phone videos just in case something does go wrong. I will later be posting what happens and if updating was even a success, and I will also mention if 4GLTE is back or if I am still stuck using 3G. I think if I am still stuck using 3G I am not going to play with it anymore and just leave it how it is. I just hope that when I go to Mexico nothing gets messed up and I can still use my phone there. That is my biggest worry. If it all fails I am probably going to wipe out my data.

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5.0.1 Update Successful
Update was a success, and for right now there is no sign of positive APN fix because my house does not have a good area of connection. But everything does seem to be ok for now. Once evverything is finished downloading because I deleted a lot of bloatware and it is all coming back I will let post if APN was fixed or not. I do notice t hat APN is still down to the 3 other APNs I had when I entered the 2 codes in build.prop, and neither is selected. But when I go pick up my siblings I will keep an eye out and see if 4GLTE does come back or not and will let everyone know if it was a fix or not.

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Finally worked...but
I had a succesful update, but it did not work. I was not happy about that. I went into lollipop and it was a big disappointment. I hate it. Anyway, I did not see it get fixed. That is when I decided to just go ahead and factory reset everything. I did not want to do this because many people said that it did not work well when rooted, so I prepared myself in case I bricked my phone. But, it did not brick -hurray. And I got my APN's back. I just had some trouble with the WiFi's afterwards, but that is more of a problem with the passwords here and not because of the S4. For those who have had problems as well, there are several APN's needed that are hardly mentioned -and if they are I have never seen them being mentioned. I will post a picture. According to some people all you need is the APN section for it to work. I will also make a guide on what you can try to do if you do not want to factory reset your phone like me. It was a pain. I lost a lot of cool things I had on my phone, but hey I got 4G LTE back.

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As you can see, this is what I currently have for APNs. If you do not have those, I will show you how to get them inserted if they are greyed out like mine.
The larger text us known as the title. I heard you can name that whatever you want, but you would still want to keep the same title. What matters is the APN or smaller text. That what is important.
Sent from my SPH-L720 using XDA-Developers mobile app

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Finally...my way of fixing it APN problems with most sprint phones I hope.
First of all, you will need to be rooted or you will have to do a factory reset on your device in order to solve this issue. I cannot tell you how to root because every device is different.
Once you are rooted, you will download some kind or root browser. My favorite is called root browser
Once you have that, open it up and grant it root permission. You should see something like this
Scroll down to where you see system on this page
Hit system and scroll down until you see build.prop
Tap on it and you will see something like this
Tap on RB Editor and you will be guided to a bunch of text. DO NOT MESS WITH THE TEXT. Just scroll all the way down. Once you are all the way down, you will input the following two lines at the end:
ril.sales_code=LOL
ro.csc.sales_code=LOL
Save it and go back. Once you save it, go ahead and reboot your device. Once you boot up go back to the play store and get Change APN
Open this up and you will be able to edit your APN settings. I am not going to mess with mine anymore so I will not have any screenshots. But make sure you click on the plus sign on the top to add and add all the ones you see here
You will be adding APNs with title and APN only. Add all the ones you see on the screen and save them. Once you have all of them, exit out and go to settings>connections>more networks>mobile networks. Under network mode click on automatic. You should not have to reboot but if you do then do so.
You might not have the automatic selection. If you don't then just click on CDMA/LTE. then go back to build.prop and erase the 2 lines of code and reboot once again.
Go back to the mobile networks and see what happens. Try going into automatic if you were not and reboot again if you have to. If this did not work then I guess it's factory reset like me. I'm sorry.
I hope I nailed it. If not let me know.
Sent from my SPH-L720 using XDA-Developers mobile app