Zenfone ZE551ML can't connect to LTE or 4G - Android Q&A, Help & Troubleshooting

I've bought a european market ZE551ML and have it on the metro PCS network. Every APN I've tried both T-mobile and Metro fail to give me LTE or 4g. I had a previous ZE551ML that was on the same network that had no problem getting LTE. WW firmware phone with 4.21.40.352 MM Installed. The phones rooted and bootloader unlocked. I can get hspa+ but LTE is the problem . Attached are the Screenshots from my APN and phone settings as well as random network Data. Im a network engineer with alot of experience and I've tried everything I can without success a little help would be much appreciated and would using a custom ROM help in any way.
Unfortunately after adding over 7 tinypic URL images I had to delete them cause This is my first post which im sure would have helped alot.
Anyways thanks ahead of time.

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[Q] A way to get 4G or 4G LTE on Verizon Galaxy S4?

I have a Verizon Galaxy S4 rooted and running the Darthstalker S4 Rom. I recently got an ATT sim card to put into my device because they were second best with the signal where I live. Which is the US. What I want to know, Is there a way to get 4G or 4G LTE on my device with ATT? I know 4G is here because my cousin is with them and has 4G LTE. Ive tried a few APN settings to no avail. Also every once in awhile I completely lose service because it starts searching for a service to run on again. All I get is H or H+ and half of the time, I dont even get that. That data never really works on that. Especially H. Also, I never get 3G either. Sorry if this is long, Im just at an end where I cannot find an answer. Any help would be greatly appreciated. Thanks
mouthymotor said:
I have a Verizon Galaxy S4 rooted and running the Darthstalker S4 Rom. I recently got an ATT sim card to put into my device because they were second best with the signal where I live. Which is the US. What I want to know, Is there a way to get 4G or 4G LTE on my device with ATT? I know 4G is here because my cousin is with them and has 4G LTE. Ive tried a few APN settings to no avail. Also every once in awhile I completely lose service because it starts searching for a service to run on again. All I get is H or H+ and half of the time, I dont even get that. That data never really works on that. Especially H. Also, I never get 3G either. Sorry if this is long, Im just at an end where I cannot find an answer. Any help would be greatly appreciated. Thanks
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Try flashing the latest Modem, it seems to to support the ATT LTE Bands. I have used an AIO sim in both a VZW GS4 and LG G2 and both get LTE. It doesn't seem to switch very quickly either. Also make sure you are have LTE/GSM selected for the radio.
My 2 cents
rinkde post
equake said:
Try flashing the latest Modem, it seems to to support the ATT LTE Bands. I have used an AIO sim in both a VZW GS4 and LG G2 and both get LTE. It doesn't seem to switch very quickly either. Also make sure you are have LTE/GSM selected for the radio.
My 2 cents
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Could you point me into the right direction? Also, I can only choose GSM, or LTE. Not both at the same time. And GSM only works
mouthymotor said:
Could you point me into the right direction? Also, I can only choose GSM, or LTE. Not both at the same time. And GSM only works
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Kinda dependent on the ROM but you might want to use the APP called Advanced Signal Status (Play Store).
From memory you can't since this model dosent support the other carrier's LTE/4g band. May be wrong but pretty sure that info is correct
Sent from my SCH-I545 using XDA Premium 4 mobile app

Used my VS985 while traveling (foreign sim) with no problems

This may be totally obvious and non informative to some and for that I apologize, but I'm putting it out there anyways.
I recently traveled around South Africa for a bit and was able to use my Verizon LG G3 VS985 rooted bumped running official CyanogenMod 11 latest nightlies (via cyandelta) with absolutely no problems. I put the Vodacom sim (South African cell company) in the phone and it worked perfectly. I was able to get HSPA, 3G, and EDGE without any problems and no modifications made to anything. The phone did all the work automatically.
Supposedly there was LTE available in some parts of the country, but I could never get it. I tried switching APNs, changing radio radio bands in the *#*#4636#*#* and still could not get it. I was tempted to try and unlock the other LTE bands (as seen in a thread that I'm too lazy to look up at the moment) but I decided to hold off until later.
I also put the Vodacom sim into my LG G2 that was running a stock rooted something and that worked perfectly too(still no LTE). Was weird using that again though after the G3. Made me really appreciate the bad ass-ness of the G3.
Anyways hope this was not a waste of post. Rock on G3
Always good to hear a firsthand account from a traveler.
It would be useful if you could post what you used for APN entries as well.
trent999 said:
Always good to hear a firsthand account from a traveler.
It would be useful if you could post what you used for APN entries as well.
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All the APNs were auto populated and I just experimented with a couple different ones. Vodacom.sa and vodacom.lte.sa were the two that I tried. Ended up just keeping it on the LTE one hoping that it would pick up LTE at some point. Both APNs gave me similar performance and service. I never had to mess with the actual APN settings or manually input anything.
That's great, but pretty strange since the vs985 requires a new APN setting to be manually entered in the USA each time I switch to either my T-mobile or AT&T sim.
Sent from my VS985 4G using Tapatalk

Unlocked T-Mobile LG V10 switched to AT&T, but LTE does not work

Hi, I have an LG V10 that I purchased from TMOBILE. I switched to AT&T, and brought my T-Mobile device with me. Everything works fine, but I cannot get 4G LTE service at all. I have tried 2 APN settings, and that does not help. I live in a large metropolitan area, and I know that 4G is available here with AT&T. Does anybody have any idea why I can only get 4G and not 4G LTE?
Thanks!
This happened to me when flashing a custom Rom, the fix for me was to change the network speed to 3g or 2g then keep changing Ap's until you see you are connected to a network. Once you see that you are connected, change it back to 4gLTE. Let me know if this worked for you.
This is the APN I use and got LTE to work. It's old APN but it works for me.
Name-LTE
APN-phone
proxy, port, username, password-Not set
MMSC-http://mmsc.mobile.att.net
MMS proxy-proxy.mobile.att.net
MMS port-8080 (In order for MMS to work with adblock plus, I use 8080 instead of 80 because using port 80 will cause the MMS not to work)
MCC-310
MNC-410
Authentication type-Not set
APN type-default,mms,supl,hipri (hipri is what makes LTE to work. Without using "hipri" I only get 4G, not LTE. No need to use "fota". It is for tablets)
APN protocol-IPv4
If changing to this APN setting and you still don't get LTE, reboot the phone.
bkgibby said:
This happened to me when flashing a custom Rom, the fix for me was to change the network speed to 3g or 2g then keep changing Ap's until you see you are connected to a network. Once you see that you are connected, change it back to 4gLTE. Let me know if this worked for you.
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Wow, i was thinking i was the only one with this wierd problem, i had a lg g3 tmobile with this issue, when i was on wifi for large periods and the back to data, the 4g lte appears like it was working fine, but it never gave me access to inteternet, then i had to revert to 3g or 2g, and when it connects and works, i revert back to 4g lte and works fine, until i get wifi, and the same all over again, but this only happen to me with lg on tmobile, i had htc, samsung and this problem does not seems to happens with that brands, so i tougth it was the lg g3 itself and i sell it, but now i get a brand new v10 with tmobile and the problem is still the same, and i donĀ“t find anything on the internet about it, until i see this post, do you know why is this happen? im on mexico, and i use my phones whit telcel
Have you tried apn unlcok?
Diag 277634#*# and look for the "APN UNLOCK" option
jkyoho said:
Have you tried apn unlcok?
Diag 277634#*# and look for the "APN UNLOCK" option
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Click to collapse
when i hit the apn unlock option appears a message that tells me: "apn has been unlocked" or something like that, but the phone stills the same, do i have to do something else besides manually enter apn settings from my operator?
A word of advice I have an unlocked t-mobile lg v10 and I have had the same issue as you and believe me I tried every possible fix and nothing worked until I tried this fix ( put your sim card in another AT&T device in my case my girlfriend has an AT&T iphone 6 and leave it for a minute or 2 once you see the 4G LTE on that device remove it and put it back into your phone and you will have the 4G LTE all the time, of course you need to set up your apn but like I said I spent a whole month and tried everything before I came to that fix because nothing else worked) I hope that would help you.
I totally switched iphone 6 SIM on unlocked LG v10 ,,,but i saw LTE for 5sec and then back to 4G ...
Don't know if it will work ..
Just a network access problem, you should save yourself some time and just.... Call AT&T customer support?
Or hit the AT&T V10 forums for correct APNs. I'm sure you aren't the first person to deal with this issue.
Yes u can have 4G LTE ...just activate with a AT&T 4G LTE IMEI
missexe10 said:
Hi, I have an LG V10 that I purchased from TMOBILE. I switched to AT&T, and brought my T-Mobile device with me. Everything works fine, but I cannot get 4G LTE service at all. I have tried 2 APN settings, and that does not help. I live in a large metropolitan area, and I know that 4G is available here with AT&T. Does anybody have any idea why I can only get 4G and not 4G LTE?
Thanks!
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i have the same senario...recently moved to AT&T with the UNLOCKED Tmobile LG V10 and every thing works just fine with AT&T SIM except no 4G LTE and when you asked At&T they will try to convince you to buy their device to get 4G LTE signal....it took me a while to figure it out that u can get 4G LTE on an unlocked LG V10 if u activate the service with any AT&T 4G LTE capable device IMEI..... One more thing.. u are on your own to provide the LTE capable IMEI to customer service. That means don't except to walk in to AT&T store and borrow the IMEI from their display unit..coz they wont let u do that.....
The T-mobile phones pick up perfectly on ATT, it's most likely an APN related issue.

Samsung s6edge plus sm-g928v 4g error

Hello friends .
I'm sorry I am writing because I english translation program .
I live in Turkey. S6edgeplus - 928v phone models came from abroad. but the phone does not open 4G - LTE in turkey. *#*#4636#*#* it says LTE ONLY do I do when the connection was severed, and the line was disconnected . I could not find a solution in turkey please help me . Thank you very much in advance
Go into setting then mobile network and set network mode to umts GSM lte. If you're trying to get 4g while on a call, I can't figure that out. It doesn't work for me neither when I use an att sim card in a Verizon phone. I can't get Internet while on a phone call.
warriorpluto said:
Go into setting then mobile network and set network mode to umts GSM lte. If you're trying to get 4g while on a call, I can't figure that out. It doesn't work for me neither when I use an att sim card in a Verizon phone. I can't get Internet while on a phone call.
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Thank you for your interest . but according to my research yesterday 3-7-20 LTE bands in Europe . I do not have my phone with this band . I do wonder how do I install or installing the ? I use my phone that is not loaded
Same problem on tmobile on 5.0 I wonder if its a marshmallow problem too. IT only worked when i first switched from verizon to tmobile and had advanced calling enabled through verizon. Somehow it tricked tmobile or the phone into working with data and call? Since i did a factory reset though now with tmobile sim no luck Im waiting to update soon myself almost done downloading the update

Stuck with 2g since march.

Hi there i bought my note 3 pro with some vendor rom 7.1.99.99 and it ony worked 2g in both sim slots. Tried already flashing all kinds of ROMs tricks using qpst etc the outcome is the same. Do you have any more ideas to recovery at least 3g?
skriller said:
Hi there i bought my note 3 pro with some vendor rom 7.1.99.99 and it ony worked 2g in both sim slots. Tried already flashing all kinds of ROMs tricks using qpst etc the outcome is the same. Do you have any more ideas to recovery at least 3g?
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Click to collapse
What is your phone carrier/provider, I would check what your provider supports in terms of Network Bands/ Frequencies.
You may likely need to switch to another phone carrier to have it working on 3G or better yet 4G.
If you do have the supported Bands/ Frequencies, I can help you with setting them to work with GSM network, LTE network, or setting between the two. (You just got to provide what country you use your phone if you are unable to provide your phone provider or simply do not know).

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