Data 4g 3g keeps dropping connection. - Sprint Samsung Galaxy S 4 Q&A, Help & Troubleshoot

When I'm on 3g cdma only mode, I can keep a data connection. When I switch to cdma/lte mode, it sometimes takes a while to finally get 4g data. I'll have plenty of signal and in different parts of my County, it acts the same. This started last night. I did a ##72786# and it didn't help. I tried manually updating prl and profile. It didn't help. Today I flashed mf9 full in Odin then did full factory reset and wipe in accounts. Still flaky connection. Tried updating prl and profile and 72786 and still don't have a steady connection. As I type this there isn't any data. The 4g will flash then 3g then no data in under a second. Now 4g just came back but no telling for how long.

Its probably because they are launching 4g in your area and its very spotting. That's why your phone drops signal. Because its trying to switch from 3G to 4G. I would say to stay on just 3G.
Sent from my SPH-L720 using Tapatalk 4

Lte is already in my area. It seems to be stable now. Long story short, I changed mode into cdma evdo. Updated profile. Changed back to cdma evdo lte. shut down phone and removed battery. Held power button down for av minute straight. Put battery back in and powered on. It seemed a little more stable but not rock solid. Drove home and 4g is staying on now. Probably a hiccup with the phone last night. I'll run it for 24 hours to see if it's stable again.

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EVO gets stuck roaming

At my work I get 0-1 bars of Sprint service, and my phone often roams onto Verizon (we have dozens of Verizon repeaters in our building). The problem is that quite frequently lately it will get stuck in roaming mode and never switch back to a Sprint tower. I have 6 bars of Sprint service at home, but it will remain in roaming mode. I have the newest PRL (60670), and the old PRI (1.34_003).
Anyone else ever experience this? Any idea what I can do to fix it?
I have had this happen in the past as well. What I did was go into settings and change the roaming option to "Sprint Only" which forces the phone to switch back to the Sprint network. Then you can change the roaming option back to "Automatic".
I get this a lot as well. I've started to make a habit of turning on airplane mode, then turning it back off... when it scans for signal it will go back to Sprint.
Sorry if i'm stealing this thread. Is it pretty bad if my phone has to go in roaming to get signal in most my house? I've seen the threads about people getting a airwave because they get dropped calls, but since i have to roam in more than half my house, does it seem possible i could get one from sprint?
And my house is in the middle of town, if you go outside there's 4g, but not inside.
fastamx79 said:
I get this a lot as well. I've started to make a habit of turning on airplane mode, then turning it back off... when it scans for signal it will go back to Sprint.
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Same here, I just toggle airplane mode on and off.
Same thing on my EVO. It'll roam when it should but it won't switch back to Sprint when it should.
I chatted with Sprint asking why this happens. They just said I have free roaming. No reason why.
Yep, My Evo has been doing this as well. Been doing the airplane toggle trick. Thought about just leaving it, but was thinking that it may burn my battery faster? Anyone have any thoughts on that..
My PRL is also 60670, but I have the 1.71_003 PRI.
Guys if you have any type of active data connection the phone will not drop the roaming.
I roam at work too and if i turn on Aonline radio, tjen get in my car and drive, so long as the radio streaming is going iy will never drop the roaming.
Sent from my PC36100 using XDA App
Messed with the phone again tonight. Got stuck roaming again. I was not transmitting anything, and even ATK'd everything to make sure. Who knows, not really a big deal, unless I am eating more battery.
v_lestat said:
Guys if you have any type of active data connection the phone will not drop the roaming.
I roam at work too and if i turn on Aonline radio, tjen get in my car and drive, so long as the radio streaming is going iy will never drop the roaming.
Sent from my PC36100 using XDA App
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That makes perfect sense. I sync with my Exchange server at work and the way EAS works is a constant connection between the client and server. One question though. Has your phone switched back to your carrier with no data connection?
Yeah just disable always-on data or cycle airplane mode to make it switch back. As long ad its maintaining a data connection it will wait to switch back from roaming so it doesn't unnecessarily disturb your connection if you're in a poor service area. It shouldn't be using any more battery.
Also, atk is bad.

Losing 3g with stock Epic

I've got a stock non-rooted Epic and I seem to be constantly losing the 3g signal. It usually happens when I come out of airplane mode. I work in the basement of a hospital where there's no signal so I always put it in airplane mode. When I leave work I take it out of airplane mode and the signal bars come back, but not the 3g icon. If I check under Settings>About Phone>Status it says "connecting" under Network. If I try doing the System Updates, like Firmware, Profile, PRL, or Android, it will sometimes but not always bring back the 3g.
I've called Sprint and they had me go into the Service Menu and Restore the phone with my MSL. It worked the first time but now it doesn't seem to always work. My current PRL is 60674.
Same problem I had with my first epic. I couldn't get the 3G to come back up for over two days. Go get a replacement. The one I have now is flawless(knock on wood) good luck

Roaming and EG22

Anyone having any luck with Roam Control on EG22? I'm running the EG22 w/ EG22 modem. Everything looks to be working fine except for one huge glaring problem...roaming. I have all the roam guard nonsense turned off. I hit Roaming Only, I get the little triangle and even see it in the debug connected to VZW but I never get any data connection. I've tried rebooting, etc.
I would love to hang out on EG22 but without roaming this thing is worthless to me. At work I have to force roam since Sprint data has been dead downtown for over a year.
Works fine for me
remember, data won't show if you're connected to 4g or wifi.
LunaticWolf said:
Works fine for me
remember, data won't show if you're connected to 4g or wifi.
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Hmm... no 4G or WiFi here. It just shows the triangle with the signal meter, but of course there is no data connection.
I flashed the DEODEXED version by decadance. What version are you using? are you using the EG22 modem? I haven't tried to flash an older modem yet.
Make sure you have data enabled. hold the power button and then click data network mode.
Tried with rc 1.4 and it worked, the 3g data symbol doesn't show up till you request for internet. Both time I tried took 1 min to handshake.
I am using prl 11114 and my suppose to be 3g data roam speed is at cdma speed dl is caped around 120kbps on verizon full signal bar.
Sent from my SPH-D700 using XDA App
the newest RC works for me, but the modem crashes and reboots every time I go into roaming, but it reboots into roaming fine so I haven't really worried too much
I checked all that. It just doesn't handshake for some reason. I remember this same issue on the very first Froyo leak. Weird thing is I tried the roaming on the very first GB leak and it worked just fine.
I'll have to flash around some modems, try a different release of EG22 and see if I can get this working. This feature is a huge must for me.
Got it working... ODIN'd to this version of GB and it worked first shot. WOOHOO!! Loving it.
http://forum.xda-developers.com/showthread.php?t=1184134

[Q] Dropping data connection

anyone experiencing data drops particularly when the phone is in weak 4G coverage? It acts like it cant switch between 4G and 3G. sometimes it might take 5 min or more before it will reconnect to data. the phone works fine when it is in a strong signal area. So far I have just experienced this behavior in low signal coverage.
Yesss! Experienced that yesterday. But came back on in 5 min. Usually fixed when u go to settings and switch from the lte to GSM and back to lte but haven't had trouble with it today
Sent from my XT907 using Tapatalk 2
check this thread: http://forum.xda-developers.com/showthread.php?t=1893010
has links to other threads as well
Yours is the first case I've seen where data drops altogether, most have just been going back to 3G too often.
jntdroid said:
check this thread: http://forum.xda-developers.com/showthread.php?t=1893010
has links to other threads as well
Yours is the first case I've seen where data drops altogether, most have just been going back to 3G too often.
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I am having the no data issue as well! I leave my house (on wifi and supposedly 3G or 4G) and I want to start listening to music immediately in my car but I have no data connection once wifi is off. It can take over a minute or more to get a data connection! I was wondering if this had to do with LTE protocol negotiation, as this is my first 4G phone. However it seems way too slow and its very aggravating. When it does get data back, it is usually 4G not 3G. Toggling data mode on and off doesn't fix it. I have not yet tried toggling between CDMA and GSM.
emkman said:
I am having the no data issue as well! I leave my house (on wifi and supposedly 3G or 4G) and I want to start listening to music immediately in my car but I have no data connection once wifi is off. It can take over a minute or more to get a data connection! I was wondering if this had to do with LTE protocol negotiation, as this is my first 4G phone. However it seems way too slow and its very aggravating. When it does get data back, it is usually 4G not 3G. Toggling data mode on and off doesn't fix it. I have not yet tried toggling between CDMA and GSM.
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does it only happen when you're leaving wifi and going to cell data?
My experience with data connection was spotty for the first couple days. Going from WiFi into 4G then 3G on the way to work required a reboot to pick up the 3G after I arrived.
I think I may have found my issue.
Settings -> More... -> Mobile Networks -> Network Mode
Was originally set to "Global". I've found that "LTE/CDMA" works better for me.
hope this helps some.

LTE after loosing signal takes for ever

Every time if by some reason I loose signal (using and elevator, going in an underground parking, etc) it takes a very long time to get it back. Sometimes several minutes which is really annoying. Most times it set on E, then I have to go to airplane mode of other tricks in order to get it to LTE or H+. I've already change Sim card. Any ideas?
Enviado desde mi SM-T810 mediante Tapatalk
It's a bug, till google fixes it, use the airplane mode switch.
Also have the same problem on Verizon in the US.
Yep I just always toggle Airplane Mode in this situation.
Does the same for Sprint.
I don't lose signal. I do somehow switch to 3g from LTE but from what I've read that's a mmb29q mm bug. Never taken me several minutes to do anything on my device. Only thing I do notice is sometimes I get on 3g and I can get back LTE if i update my prl (I'm on Sprint) and reboot. This is a mm bug not carrier spacific from all I've read.
Sent from my Nexus 6P using Tapatalk
This has happened since eclair, if not earlier, and seems to be inconsistent over networks and devices. I've found it happen most often in places with overlapping cell towers with poor signal quality.
However, if you enable developer settings there are toggles for aggressive handover and maintaining mobile data with WiFi that may help to alleviate your issue.
Ok, so I switched to Cricket a while back from Verizon. I didn't notice the data drops on Verizon. But every aosp rom I've run has had some jank to some extent. Cm13 gives me the best connectivity, period, as far as wifi and data, speeds, etc. My favorite rom is screwd. It's the worst for me with lte and wifi drops. My phone won't stay on either one for an extended period of time and doesn't handoff to lte very well. What I've noticed, after reboot, is that aosp roms aren't selecting your APN and you have to manually hit that. Then sometimes, for me anyways, I have switch to 2g (the switch where the lte preferred is) then switch back to lte preferred. And that switch brings back lte faster than anything for me. Cm 13 is flawless though. It works like it should.
Sent from my Nexus 6P using Tapatalk
Ok , so did you all see post # 237 from Jason J in this thread: https://code.google.com/p/android/issues/detail?id=197102#c273 ?
Its been a week of continuous LTE. Running 6.0.1 build MMB29M from the factory. did not do any updates. no issues.
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I'm going to try this. I'm presently running with sytsemless root. Is it possible to load this without having to completely wipe the phone?
https://productforums.google.com/forum/#!topic/nexus/T5Awh6VqsG4;context-place=forum/nexus People need to sign this , get some attention on this

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