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Very weak network signal in place where all other phones have near full connection

Hi all. I bought the iMate JasJar as a converged device after a long time of having a phone/PPC duo with me. But since my PPC Axim X51V with an 8GB solidstate card was stolen, I went hunting for a converged device which was a true PDA. I found the JasJar and recieved it. My only problem is that it refuses to maintain a connections, GSM or UMTS, I have tried all the networks where I a m and none of them are better than the other. I am currently studying in South Africa, I am not a stranger to converged devices or the Windows Mobile world. But the JasJar just cannot function as a phone. I have upgraded the radio from 1.09.00 to 1.15.00 with no results. Is there anything I can do to get a consistent lock on the network? I tried the Manual network selection but that still wont help. The cell tower is also quite close to me since it is about a 5 minute walk from where I am. Please advise. Thank you and I apologize for my ranting.

I see you upgraded the radio, but have you tried other radio ROMs like 1.13 and 1.14? The latest isn't necessarily the greatest. Perhaps try some of the other radio ROMs next and see if any of them are better for you.
The thread for Universal radio's is below:
http://forum.xda-developers.com/showthread.php?t=298090
Best wishes,

There they only mention 1.15, where can i download the other radio roms?

Weaker radio than other phones
I live in a rural area in New Hampshire United State with a weak T-Mobile phone signal. I have an XDA Exec device but I cannot use it as a phone because of its bad radio receiver. I still use my XDA IIi because I can use that phone and make a 20 mins calls from work to home without loosing a connection. The XDA Exec drops about three times (at the same locations) within this distance. Where I have 3 bars on the XDA IIi, I barely have 1 bar on the Exec. I can make calls from third floor with the XDA IIi, but the XDA Exec does not receive any phone signal from the same floor. I have tried radio 1.09 and 1.13 on my XDA Exec and both did not make any different. My conclusion is the Exec seem to have a very weak radio receiver. Unless you live in the city where signal strength is not a problem, Exec does not seem to be a good choice for a phone device.

I have the same problem in the UK with T-Mobile. When I go out of coverage area for a while (say 2 hours) and then return to coverage, the phone does not (I waited 3 hours) pick up the radio signal again. If I go out of coverage for say just 10 minutes then the phone does pick up the signal again. Once the phone has lost the signal but is back in coverage, I've tried turning on Flight Mode and turning it off again and the phone still won't pick up a GSM signal.
I've had this issue with WM5 (T-Mobile UK Jan07 official release), WM6 and all of the radio ROMS that I've tried (including 1.18). T-Mobile's suggestion was to configure the phone to be GSM only (apparently the 3G signal is more patchy) and use the 1800 band only. That solution helps a little if you don't go out of coverage for a significant period of time but doesn't help if you need 3G.
I don't believe that it's a Universal issue - more of a T-Mobile issue. When I had a VF-UK SIM in the phone, I didn't have any of these issues.

PeterMcClure said:
I have the same problem in the UK with T-Mobile. When I go out of coverage area for a while (say 2 hours) and then return to coverage, the phone does not (I waited 3 hours) pick up the radio signal again. If I go out of coverage for say just 10 minutes then the phone does pick up the signal again. Once the phone has lost the signal but is back in coverage, I've tried turning on Flight Mode and turning it off again and the phone still won't pick up a GSM signal.
I've had this issue with WM5 (T-Mobile UK Jan07 official release), WM6 and all of the radio ROMS that I've tried (including 1.18). T-Mobile's suggestion was to configure the phone to be GSM only (apparently the 3G signal is more patchy) and use the 1800 band only. That solution helps a little if you don't go out of coverage for a significant period of time but doesn't help if you need 3G.
I don't believe that it's a Universal issue - more of a T-Mobile issue. When I had a VF-UK SIM in the phone, I didn't have any of these issues.
Click to expand...
Click to collapse
Cannot offer a solution - but I'm on Orange and using their official ROM (Radio v1.13), I havent had any issues with loosing signal. In fact roaming round Europe and into Russia - the phone picked up equal sometimes more networks than a Nokia N95.
Matt

same problem, I had full signal before, but today, suddenly dropped the exec, and after that, it have very weak signal.
going to disassemble it tonight.

disassembled, problem fixed now, i have signal 5 out of 5

How did you do it? I mean disassemble and fix? Any help appreciated and would let me use my Universal instead of selling it and I want to keep it because I love the device but hate the coverage.

gamefreakgcb said:
How did you do it? I mean disassemble and fix? Any help appreciated and would let me use my Universal instead of selling it and I want to keep it because I love the device but hate the coverage.
Click to expand...
Click to collapse
Opened the Universal like the Service Manual told me (downloaded from this site), then, there is a big, white plastic in in the top of the device, that's the antenna, 3 screws holding it. Unscrewed that, and I observed, it has got two little metal feet, connecting to mainboard.
Slacked that thing, so it connects more powerful.
Maybe it deformed when I dropped the device.
Assembled, switched on, and , we have got 5 signals

remember that: remove the flashlight, and the foil above it, before taking off the antenna module, if you don't do that, you can kill your flash.

[Q] Repeating cellular network using a cellphone?

I was wondering if it is at all possible to repeat a cellular network signal using a cellphone. Is such a thing possible?
I am talking about using an application on any cellphone on any network, with any OS. Are cellphones built in any way to rebroadcast cellular network signal? If not an app, does anyone have any generalized DIY information on gutting a phone and using it's internal antennae to rebroadcast the cellular signal in some way?
Example scenario: Cellphone is in a location that has full signal strength. Less than 5 meters away there is 0 signal due to a ceiling of doom. The cellphone has horizontal line of sight to the dead-zone. The cellphone in the full bars area by means of an app (or some hardware modification) is able to rebroadcast the signal to some degree towards the dead-zone.
Thanks!

Would be pretty cool, but I doubt any cell phone has a built in transmitter, which is what you need to transmit the signal.

Azure1203 said:
Would be pretty cool, but I doubt any cell phone has a built in transmitter, which is what you need to transmit the signal.
Click to expand...
Click to collapse
You are using avian carrier for your uplink?

[q&a] poor wifi reception

Hello, my problem is my note 3 LTE recently got super poor reception of WiFi signal and LTE.
Now, I am only able to pick up 2 bars of signal even my phone is 1 meter away from the router. For the LTE I am only able to reach a peak DL speed of 5 mbps instead of > 30mbps as I normally had.
I tried various fixing method, like leveling up the pins connecting the antenna and the mainboard, wipe the metal plate connecting the pins, flash ROMS,*#0011# tweak,...
What else could I do to fix the issue? Or my connectivity chip just dead ? @[email protected]
Any helps and responses are very much appreciated

Problem with internet connection a7 2016 710fd

I have been using jio 4g for past 2yrs. The internet connection was good. But for the past 6 months I am facing frequent disconnection of the internet. So I go into flight mode activate and deactivate it again the net connection will be good for a minute and then it drops again to b/S. Frustrated I changed the SIM. But same problem. The bio customer care says it to update firmware! Which was not available and at last they told me to get the mobile serviced. So I swapped the SIM to another mobile and checked. There was no problem in that mobile. Please help me. Whether it is due to SIM or the band problem with mobile. I am using a stock firmware
Ps. Even I resetted, rooted

Set the network type or RAT or network mode to LTE (4G) only, then the phone should stay on the signal even when the signal is low for a second, around -120 rsrp (signal), specifically it should normally follow the parameters sent by the network: qRxLevMin (it is half the rsrp), qQualMin (sometimes, it is the signal quality), sNonIntraSearch, ThreshServingLow (both are ranges around qrxlevmin, one for entry threshservinghigh, one for exit). These parameters should nornally not be followed with LTE (4G) only. But only if the signal drops below the limit for a second. Else, it is a waste of resources, both for you (battery, etc), and the network, though the network can deprioritize cell edge (low signal) users.
To do so, there are extended network modes (for sim 1) in a menu that comes with Android, it is called 4636, Testing, Phone info, Device info, etc. There are apps that open 4636 without root, that offer: mode selections, lte only, anything cellular related that opens 4636.
Hold the phone on its top, not its bottom, for testing, the primary reception antenna should be at the bottom for A 2016, you can check this in *#0011#, it is "ant rsrp diff", it is positive when the primary reception antenna is better, negative when the diversity reception antenna is better, the diversity antenna should in most cases power on when the cellular is in use and start measurement, in contrast to the primary that's just switched on.
The signal can be measured in *#0011#, rssi is the signal strength of the frequency, the signal strength of intra freq (same frequency) neighbors (other cell towers etc) may differ slightly anyway because it's missing a decimal point; rsrp (good maybe at least -120, get it closer to -1) is approximately the signal strength of the cell, it is a few antennas in the long rectangular boxes on a cell tower, note that it is the measurement of the reference signal not the data that is being sent to your phone; rsrq(good maybe at least -15, best -1), sinr (good maybe at least 0, best 40), are signal quality. The "registered plmn" is the currently connected operator (mobile country code and mobile network code), if it changes (different compared to the sim), the signal is low! The "PCI" is the currently connected cell, note that there are only ~500 of these, so to identify the cell you can use both PCI and TAC (region), if the pci changes and the signal strength drops, well, the signal dropped and a reselection is made to an inferior cell, which can then drop data... in this case contact your mobile network operator but they might not make changes if it only affects a few users. You may try to lock band/etc to the good cell that sometimes drops in quality for a second but overall better than the neighbour cells.
Here's a short list of scenarios that can cause problems in connectivity, not all.
1: Low signal, plain old low signal. If the phone can't register VoLTE the bands that can be connected to may be restricted on some MNOs.
2. The antenna is closed and this causes low signal.
3. Low signal of the serving cell, the signal of an inferior neighbour cell matches (above parameters!), the phone changes to another antenna on a cell tower, quality drops and so does the connection. On another cell tower or there are 2 antennas on 1 cell tower, for example 1 facing the azimuth 180 degrees, another 270, the phone being in 215 degrees is unfortunate!
4. The antenna is open and receives interference (and reselections, sometimes good) from neighbour cells.
5. Good signal but it has been echoed a bit too much.
6. Reject causes and others, where the connection has been disconnected for some reason. Probably not in this case! It is viewable in *#9900# > Take cp log > copy to internal sdcard. It is in the /internal storage/log/LitmusLog. Scroll down to the reject cause section, those are error codes.
None of these codes/volte are working: The CSC is not applied correctly! Flash stock rom and open the stock recovery or copy /system/csc/...csc.../system/ to /system/etc/.
I do not recommend anything EFS/PIT, making a backup of efs is OK!

Hi,
I am facing the same problem with a7 2016 with JIO sim.
The mobile is purchased in dubai and when insert jio sim in india, was not able to use volte service.
So I flashed official indian rom. Everything is fine except net speed. Net speed between 1-5am is very fine but in day time speed reduces.
Everytime i have to restart data to use net but after a while same problem occurs.
Tried in both sim trays. I am using single sim in mobile.
Pls provide a solution.
Regards
//aftab

DZ09 2G emitter

Is it possible to build a device that emits a 2g cell phone signal and will connect to devices with specific sim cards that allows you to use a DZ09 that only supports 2g via wifi or possibly 4g LTE or 5g cellular antennas either on the emitter or on a normal modern android phone connected to it via a cable or Bluetooth and an app? It basically needs to be a 2g to wifi/4g LTE/5G/Android Phone adapter. 9s this possible o possible already in existence? I really just want to make a 2g smartwatch (DZ09) work with some kind of data connection if that helps.

n3tfox said:
Is it possible to build a device that emits a 2g cell phone signal and will connect to devices with specific sim cards that allows you to use a DZ09 that only supports 2g via wifi or possibly 4g LTE or 5g cellular antennas either on the emitter or on a normal modern android phone connected to it via a cable or Bluetooth and an app? It basically needs to be a 2g to wifi/4g LTE/5G/Android Phone adapter. 9s this possible o possible already in existence? I really just want to make a 2g smartwatch (DZ09) work with some kind of data connection if that helps.
Click to expand...
Click to collapse
The short answer is no. Mobile communication technologies are not open source or open use - meaning that you have to be licensed to produce such hardware, and the carriers also have be licensed to use that radio band. Even if you could build a low power 2g transceiver, it would still be illegal in many countries as you'd be using radio space that belongs to a particular carrier. Worse, you'd be designing something that would act as a "host" for a 2G cell, which has some legal implications (like the infamous Stingray device).
The only bands you can use without a license are 2.4GHz, 5GHz, and part of the 6 GHz bands.
I have an amateur radio license, and I'm only licensed to use specific radio bands.