Database Users

[Q] Signal Issues

Hello.
I got a strange signal issue with my Universal. The phone will only connect to the cellphone network every now and then. GSM and UMTS alike.
I've tried a few different SIMs, most of them won't change anything. Had one that worked fine (not my sim, and costly plan).
What happened was the following: Phone was working for forever, when the provider updated the sim. The phone wanted to reboot, so I did, and the problem started. I contacted a the service provider, and they had no clue, so I contacted HTCs workshop here. They told me that they had indeed seen this before, and that they had solved it by "ordering 3G compatible SIMs", so I did. Nothing changed.
After this, I remembered that I had another sim (same provider), that was not updated yet. I put that sim into the phone, and once again the phone was connected, and working fine for 2 days, when the update came again. After restart, same issue.
I've tried updating the radio and so on, but nothing changed.
Now, I haven't managed to figure out any more, and now wonder if anybody here has experienced anything similar or know anything about it.
I kind of doubt that it's the hardware, as the non-udated sim worked, but the updated ones don't. That is also supported by that sim that actually worked. (I asked what was special about that sim, nothing).
Any tips?

I recently bought a used Jasjar, and I have similar trouble. I think it's because the GSM frequency band used by the Jasjar (I think it's 850MHz/1900MHz) is not as prevalent here in the US.. I assume there are fewer towers in my area that support this frequency band. The Jasjar was intended for non-US markets, I think. As I drive around town, there are certain spots where I lose my signal completely.... which never happened with my previous phone (an HTC Wizard, which uses a different, "more prevalent in America" GSM frequency band).
The new SIM's you are using, probably point your phone to a newer network (a different set of cell towers/radios), which doesn't support these frequencies as well.

That is correct, Universal will only work on 3G in Europe or Asia.
For America only in GSM bands

Europe
I forgot to actually mention that I'm in Europe.
Won't give up before I figure this out. Love the phone.

plumpyone said:
After this, I remembered that I had another sim (same provider), that was not updated yet. I put that sim into the phone, and once again the phone was connected, and working fine for 2 days, when the update came again. After restart, same issue.
I've tried updating the radio and so on, but nothing changed.
Click to expand...
Click to collapse
I'm no cell phone expert, but the SIM is just a memory chip with info on it. It has nothing to do with the signal quality or radio in your phone.
Inside the SIM's memory is a serial # and some info about which networks it can connect to.
So, I am guessing your new SIM's are pointing your phone to a different network, that does not use the same GSM frequencies the Jasjar uses. Or, perhaps your provider has swapped out the radios in your nearby cell towers for "newer" radios that don't support the Jasjar's frequencies. Does your phone work in other parts of town?

KSandbergFL said:
I'm no cell phone expert, but the SIM is just a memory chip with info on it. It has nothing to do with the signal quality or radio in your phone.
Inside the SIM's memory is a serial # and some info about which networks it can connect to.
So, I am guessing your new SIM's are pointing your phone to a different network, that does not use the same GSM frequencies the Jasjar uses. Or, perhaps your provider has swapped out the radios in your nearby cell towers for "newer" radios that don't support the Jasjar's frequencies. Does your phone work in other parts of town?
Click to expand...
Click to collapse
Yeah, I was thinking the same when this happened, but no one changed any equipment here. Both providers run with the same equipment, and is the same as when it worked. Got that confirmed

same problem to me!
YEah! I have the answer, Its about the channels of signal transmission, The Unis are old devices, need a high channel spectrum in the GSM signal, the new devices are more faster DSP´s in their CPUs and the spectrum of the GSM signal service scan load more devices with less channel in use (more cheaper and more services) The UNI is an old device now you may need to accept that need more channels to work in a full capacity of signal, sorry!! UNI´s and other old devices soon gonna useless

No 4G/LTE with SM-G935FD

I have a new SM-G935FD purchased in the UAE. The software version is MMB29K.G935FXXU1APD1. The phone has a "United Arab Emirates" section in the About page.
I travel a lot. I generally use a local SIM when I am in a country for some time. Right now I am in France. I am using a SIM from Bouygues Telecom but I have no 4G/LTE service at all. The phone is connecting at H+ and also at 3G, but it is not showing 4G/LTE at all.
I will be in several other European countries as well as the US soon. I specifically purchased this phone because it has all the LTE bands for the countries I spend time in. This same SIM does give me LTE connections on Bouygues when I use it in my old phone (a Motorola X 2nd Gen). I had expected this phone to just work on LTE everywhere that I typically go.
I have looked through these forums and see a thread or two about others with LTE problems. But no clear solutions.
I have tried various apps such as LTE Discovery (no luck) as well as 4G LTE Switcher - using that if I set "LTE only", I get no service at all, and then have to reboot the phone before I get service back.
Is there something I need to do to get LTE?
Thanks.

Have you put the SIM in the correct slot?

liquidguru said:
Have you put the SIM in the correct slot?
Click to expand...
Click to collapse
Yes, the bottom slot. The SDcard is in the top slot. The SIM is showing in the phone as "SIM1".

Strange. I have a G935FD and it works with LTE no problems. I've used it in Singapore and Indonesia, with different SIMs and all work.
In Settings - Mobile Networks - Network Mode, it's set to LTE/3G/2G?

liquidguru said:
Strange. I have a G935FD and it works with LTE no problems. I've used it in Singapore and Indonesia, with different SIMs and all work.
In Settings - Mobile Networks - Network Mode, it's set to LTE/3G/2G?
Click to expand...
Click to collapse
Yes it is. I've tried changing to one of the non-LTE modes and back, but no change.
In the About device / Status / SIM Card status page, I see Mobile network type as UTMS. Shouldn't that have LTE and, if so, how do I change it?

Mine says the same, but I'm only connected to 3G at the moment, so I don't know if it's normal it not. I have a 4G card in, but I'm out of my area's 4G network range.
Edit: Actually I was connected to my wifi. Now I'm connected to my 3G and it says HSPA+ now
Edit again: Ok, so my phone is jumping between 3G and H+, which is what's changing.

liquidguru said:
Mine says the same, but I'm only connected to 3G at the moment, so I don't know if it's normal it not. I have a 4G card in, but I'm out of my area's 4G network range.
Edit: Actually I was connected to my wifi. Now I'm connected to my 3G and it says HSPA+ now
Edit again: Ok, so my phone is jumping between 3G and H+, which is what's changing.
Click to expand...
Click to collapse
Ah, mine is doing the same. I see Mobile network type jumping between UMTS and HSPA+ if I watch for a while. Obviously that field is a status field, not a setting field.
Thing is, I am in an area with full LTE coverage.
At least you seem to be confirming that this should work. Still need to figure out what the problem is.

I have the same Problem in Spain. With a Vodafone Card I dont have 4G Connection (The same card in a the Galaxy S5 of my wife works with 4G). But with a Yoigo Card I have 4G Connection. The software version is MMB29K.G935FXXU1BPH6. The phone has a "United Arab Emirates" section in the About page too. Any Idea?
Thanks

OP2 not able to connect to LTE

Hi,
Both my daughter and I have OP2 devices. She runs OOS 3.6.0 and I have Resurrection-Remix-N-5.8.5 (highly recommended BTW), with the latest 3.6.0 firmware. Now, neither of us are able to connect to LTE, but only to 3G. It doesn't seem like an operator issue, as my son's ASUS ZenFone 2 device is able to connect to LTE with the same operator. For what it's worth, I can see using the Network Cell Info Lite app that my device is connected to a nearby 3G antenna, while my son's ZenFone is connected to a more far away 4G antenna. Would appreciate any insight regarding this matter.

OK, found the reason (even if not a very comforting one): Got the US model of this phone, which doesn't support LTE band 3, used by all operators here.

Suggestions on 4G LTE stick for use with Android HU and AT&T in the US

So I have a free spot on my family plan and was thinking I could just get a BYOD sim and stick it in a 4G LTE stick for use with my Android HU. All the ones I have seen has compatible miss all the relevant bands for US use, specifically for AT&T. Does anyone in the US have any suggestions?

I second this thread for Verizon.
Sent from my iPhone using Tapatalk Pro

So I finally got my dongle and SIM card and it is working and pretty much without any extra apps or root.
I purchased the HUAWEI E397 4G usb dongle 100M data card Unlocked 4G LTE MODEM B397Bu-501 - the important part is the -501 at the end they have several models with different band compatibility and the 501 was the one with AT&T compatibility.
On my Eonon GA2167 after I installed the stick the Cellular Networks entry showed up automatically in the options, I was able to edit the APN data there (you will likely want to be connected to wifi when you do this, if it's trying to provision data you wont be able to select APN data). I just copied the APN data from my phone and it worked. Using Cricket (AT&T).
I had some trouble getting it to work at first, it would recognize the USB stick allow me to edit APN and then connect to the network but I had no data connectivity. Eventually it started working. Not sure if this was after I copied every APN setting (previously I had just entered name, apn and the MNC and MCC) once I added the MMS/MMSC data and APN type it started working a little after that. But it could also been on the network side since it was a new SIM I had just activated hours earlier and had been inserted into 2 other phones (to help try to activate it).
Anyway if someone wants a stick that works on AT&T bands in the US this should work. The headunit only shows a 3G connection and reports WCDMA with signal check lite, but I think that's due to the firmware of the HU not being setup for 4G LTE, with a speed test I get about 8-9 Mbps down and 6-7 up, not super fast but I believe that is LTE speeds since HSPDA doesn't support uploads that fast, also the stick itself shows a cyan LED with is meant to be for LTE connected network. Either way its way faster than the wifi connected to the hotspot on my phone (not sure if its the wifi antenna or what but wifi performance is very subpar on this unit). Also it connects quicker on startup (and does so automatically) than wifi.

jakejm79 said:
So I finally got my dongle and SIM card and it is working and pretty much without any extra apps or root.
I purchased the HUAWEI E397 4G usb dongle 100M data card Unlocked 4G LTE MODEM B397Bu-501 - the important part is the -501 at the end they have several models with different band compatibility and the 501 was the one with AT&T compatibility.
On my Eonon GA2167 after I installed the stick the Cellular Networks entry showed up automatically in the options, I was able to edit the APN data there (you will likely want to be connected to wifi when you do this, if it's trying to provision data you wont be able to select APN data). I just copied the APN data from my phone and it worked. Using Cricket (AT&T).
I had some trouble getting it to work at first, it would recognize the USB stick allow me to edit APN and then connect to the network but I had no data connectivity. Eventually it started working. Not sure if this was after I copied every APN setting (previously I had just entered name, apn and the MNC and MCC) once I added the MMS/MMSC data and APN type it started working a little after that. But it could also been on the network side since it was a new SIM I had just activated hours earlier and had been inserted into 2 other phones (to help try to activate it).
Anyway if someone wants a stick that works on AT&T bands in the US this should work. The headunit only shows a 3G connection and reports WCDMA with signal check lite, but I think that's due to the firmware of the HU not being setup for 4G LTE, with a speed test I get about 8-9 Mbps down and 6-7 up, not super fast but I believe that is LTE speeds since HSPDA doesn't support uploads that fast, also the stick itself shows a cyan LED with is meant to be for LTE connected network. Either way its way faster than the wifi connected to the hotspot on my phone (not sure if its the wifi antenna or what but wifi performance is very subpar on this unit). Also it connects quicker on startup (and does so automatically) than wifi.
Click to expand...
Click to collapse
Thank you for this info! Where did you buy yours?
Has anyone tried this on a Joying_JY-UM135N or JY-UM135N2?
When I look at this listing on aliexpress, further down, it lists a number of "Network Bands", including the -501. How should I interpret this? Does the modem support all those bands, or do I have to specify when ordering? When I search for "huawei e397" on Amazon, it shows me a -53 version. Is this the same as the -501, or different? I'm also curious as to why the only hit I get on aliexpress is a listing in the Netherlands. ??

GaryGood said:
Thank you for this info! Where did you buy yours?
Has anyone tried this on a Joying_JY-UM135N or JY-UM135N2?
When I look at this listing on aliexpress, further down, it lists a number of "Network Bands", including the -501. How should I interpret this? Does the modem support all those bands, or do I have to specify when ordering? When I search for "huawei e397" on Amazon, it shows me a -53 version. Is this the same as the -501, or different? I'm also curious as to why the only hit I get on aliexpress is a listing in the Netherlands. ??
Click to expand...
Click to collapse
There are 5 different variants (2 off which offer CDMA/EVDO for 3/2G). They are all the same base stick but vary depending on bands supported.
This website details each on and the bands its supports: https://www.4gltemall.com/huawei-e397-4g-lte-mobile-internet-key.html
I bought mine from Aliexpress, you will want to make sure you specifically get the -501 for AT&T I believe the -53 supports some T-Mobile bands.
You might want to hold off till I can report more tho. After initially getting it working, it is proving to be inconsistent, I'm not sure if its a low power issue (I have ordered a Y USB cable) or something else. The -501 don't support the full compliment of AT&T bands and I'm not sure if that is the problem, it is missing band 2 for 3G and Bands 2, 4 and 12 (though 17 is kind of part of 12). I know in my area they use Band 2 for both LTE and 3G and I'm not sure if that is my issue. I seem to struggle to get it to work at home but if I am driving around town it will pop up and connect, FWIW once its connected its solid even at home until I disconnect and try to reconnect.
I will update has I make progress.

I have the exact same head unit and have the exact same issue, except I live in Australia and I'm pretty sure I have a spare Telstra (AU telco) dongle lying around, so it literally just works right out of the box? I thought these do support 4G, or at least I thought I saw it advertised like that (or maybe those are the Android 8.0 ones). What else have you done with your head unit OP, not many ppl it seems have this model and look to modify it lol.

It supports 4G speeds, when I get a connection in a 4G area on a band my dongle supports, the icon on the headunit shows 3G, but I get 4G speeds. I thinks its just a case of the limited firmware not supporting the icons and reporting for 4G but since all data transfer is handled by the stick then it works at those speeds.
A bit of an update. I bought a USB Y cable in case lower power was an issue, for the first 4 times after getting the cable things worked right away at boot up with no interference, that was a couple of days ago, since then it hasn't happened since. I am likely going to order a Momentum 313U, its AT&T branded and supports its full compliment of bands, but no idea on Android support. The only 2 things I could find about Android support was a generic listing on Aliexpress showing what appeared to be a 313U and stating it was an Android device and a Pilipino website saying it wasn't recognized by an Android Tablet (I think that's what google translate was telling me).
Failing that I will order a Huawei 303C, it supports the full compliment of AT&T 3G bands and is on the confirmed working list. No 4G but I think AT&T still has full coverage of HSPDA in my area along with LTE.

I have the exact same head unit from eonon and purchased the AT&T usb velocity stick off their site and plugged it into the USB port and it does not recognize it. The led is lit up on the stick but nothing on the head unit. It would be nice since this one has external antenna ports and supports LTE. Is there any software I need to install on the head unit?

Another update: I ended up buying a Huawei E303c stick, works on all the AT&T 3G bands and I haven't had an issue with it at all. max download speed has been around 3 Mbps but that is enough for voice commands, Pandora and navigation so I'm happy. I got closer 10+Mbps with the 4G stick, but I only worked some of the time (I think due to AT&T using multiple 4G bands in my area and the stick not supporting them all).
Anyway the Huawei E397 is up for sale and I'll suffer with 3G speeds.

jakejm79 said:
Another update: I ended up buying a Huawei E303c stick, works on all the AT&T 3G bands and I haven't had an issue with it at all. max download speed has been around 3 Mbps but that is enough for voice commands, Pandora and navigation so I'm happy. I got closer 10+Mbps with the 4G stick, but I only worked some of the time (I think due to AT&T using multiple 4G bands in my area and the stick not supporting them all).
Anyway the Huawei E397 is up for sale and I'll suffer with 3G speeds.
Click to expand...
Click to collapse
I just got a Huawei E303c stick for AT&T. I plugged it into my generic Atcgfheny Oreo head unit and it shows no 3G icons. It blinks a blue light, but not connectivity on the head unit. Is there something else I need to configure? I can't find any settings in the menu.

Rooted K20 Plus (T-Mobile) stuck on 2G network

Hey everybody,
Recently rooted an American T-Mobile K20 Plus and removed the restriction on the network for use in Ireland. I can now register the phone to any network associated with the SIM card inserted into it. Unfortunately, the phone does not appear to be able to connect to anything but 2G internet even after changing Network Mode from GSM only to GSM/WCDMA/LTE auto.
I'm wondering if there are any security measures pre-installed in the phone to block 3G or 4G internet outside of the USA or have I made any stupid mistakes? Phone pretty much needs the better connectivity for use as a hotspot. Any ideas would be great, thanks.

I have the same problem

Is it at all possible for you to access the phone's hidden settings and change the radio band under phone info to Automatic or Europe. It's likely it is set to United States by default.

K20 plus isn't able to use the frequency that irish carriers support.
https://www.frequencycheck.com/compatibility/zKG0sZp/lg-tp260-k-series-k20-plus-2017-lte-a/ireland