Database Users

GSM signal dropping and then disappearing?

I have had my HD2 since March 2011. It is unlocked, HSPL 2.08 and radio 2.15.50.14. Apart from the known issues with the Phone Canvas with later WM6.5 builds it has been fine. I have been cooking ROMs since my Wizard and then the Blackstone so I am reasonably experienced. I currently have my own custom build installed based on 5.2.23568.
For about a week now it seems to have developed a fault in that the GSM signal just drops off and then goes 'searching'. If I soft-reset the phone it will usually come back and then start to drop off again. If I disable the GSM radio and then re-enable it sometimes it won't enable immediately and might take three goes at the slider going green and then it asking for my PIN.
I have hard-reset, installed various different radios and recently re-flashed but the issue remains. I have also taken the case off the phone and ensured the 'touch' connecters are making contact with the antenna in the case housing. I ahave also reflashed te stock ROM and still the issue remains.
I have now reverted back to my Blackstone as it has become intolerable.
At the moment I have the Blackstone and the HD2 sat next to each other (both with Vodafone SIM cards installed) and the Blackstone has all 4-bars displayed and the HD2 has the 'Martini glass' searching symbol displayed.
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Its an eBay purchase but is more or less immaculate - it isn't something I can get my carrier to repair if it is a hardware fault.....
Any ideas

First (not trying to be rude) have you swopped sim cards to ensure its not a sim issue?
Next (I read on you trying different roms) task 29 and reinstall a stock win mo rom, its been known that on occasions failures are resolved by doing this, if it works they put your rom back on.
sadly thats the best I can offer

Like above check sim card fully & network for issues.
I had a very similar issue on my old Touch Pro, signal would go weak & sometimes overnight would loose conection & I would need to toggle flight mode & then all would be ok.
I started think that was likely hardware after calling network & tech support was convinced my device, well turned out was network prob & only linked to that one sim & how it registered to tower !
So check it out well.
Also you could try padding the back of the sim with some tape in case it is a sim contact issue ... & perhaps flash a stock ROM from SD so everwrite HSPL,Radio & also rilphone.dll will all be paired as should be !
All long shots but not much else left ... Good luck ...

I have similar problem. The phone has weak signal and it looses signal on weaker spots where other phones have full signal.
I have HD2 from US and I am in Europe. Maybe I should put some Europe RAdio?
Also sound is very low.

hrga said:
I have similar problem. The phone has weak signal and it looses signal on weaker spots where other phones have full signal.
I have HD2 from US and I am in Europe. Maybe I should put some Europe RAdio?
Also sound is very low.
Click to expand...
Click to collapse
Take CARE when flashing radios as non compatible versions on a US T-Mobile HD2 could result in HD2 paperweight.
My HD2 seems on par with other devices I have compared it for reception strength & I use it in some weak areas without issues.
Have seen a few posts on weak reception so it is either a particular SPL Radio & ROM combo is to blame or hardware issue if unlucky ...

Thanks for the replies it's much appreciated.
Firstly I have swapped SIM cards around (Vodafone Contract SIM & Vodafone Pay&Go SIM) and the fault follows the HD2. I think it has to be hardware or somthing 'unique' with my IMEI number and it registering?
It seems bizzare as I can sit here and watch the signal bars gradually drop off and then it go to 'searching' whilst the Blackstone just sits there happily with 3-bars and never budges.
I am unsure how to approach Vodafone about it as its my own phone (not supplied on a contract) and I think they would be able to give me some technical information as to what's happening with the registrations.
Andy

ADB100 said:
Thanks for the replies it's much appreciated.
Firstly I have swapped SIM cards around (Vodafone Contract SIM & Vodafone Pay&Go SIM) and the fault follows the HD2. I think it has to be hardware or somthing 'unique' with my IMEI number and it registering?
It seems bizzare as I can sit here and watch the signal bars gradually drop off and then it goe to 'searching' whilst the Blackstone just sits there happily with 3-bars and never budges.
I am unsure how to approach Vodafone about it as its my own phone (not supplied on a contract) and I think they would be able to give me some technical information as to what's happening with the registrations.
Andy
Click to expand...
Click to collapse
I would recommend try other network sims or a foreign sim & you can then connect to various networks (roaming) & test signal reception.
That is how I got evidence that it was my network (DTAC) at fault, luckily my network main Office is near my work office so I turned up & pushed the issue until they produced a technical individual with the required knowledge & gumption to help resolve the issue.
The Phone Techies are useless unless you get lucky & we are talking national lottery lucky here.
Chances of hardware are quite high too as a few threads along same issue as yours are around on HD2 reception.

It gets more bizzare - Since the Leo is just better than the Blackstone I decided to take both with me and keep the Blackstone as 'fallback'. Tuesday & Wednesday I worked in Hull and the Leo worked just fine. Went out to the pub last night and the Leo just wouldn't register. Over a period of about 15-minutes I tried soft resetting, taking the battery out etc but nothing. I gave up and left the phone on the bar whilst I was talking to someone and then 5-minutes later I get a text - check the phone and its got 3-bars of signal? I sent a text reply and then the phone seemed to be OK.
Today the phone has been in the same position at home where I took the photo above and its not lost connection all day (so far).
I don't know what to think but I still believe it isn't fixed....
Andy

Wifi roaming question/problem

My wife and I both have galaxy s2's and I've set the house up with 3 wireless routers... The problem is when roaming throughout the house the phones don't want to make the jump from one router (same ssid's/settings/passwords/different channels) to another. If I turned Wifi on and I'm on the middle floor I have max signal strength... If I move upstairs and stand next to the other router my signal on the upper info bar is at its lowest.... If I look at available networks though it shows my strength at max. It's only when I shut the Wifi off for a few seconds then back on that it Connects to the strongest channel but the process will repeat again when I go downstairs. What can I do to get our phones to switch to the strongest channel automatically? This is really annoying...
Sent from my GT-I9100 using XDA App

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Here you can see what i mean... The strength is excellent when I view the network but it's still connected to the channel for the router downstairs even when a stronger "excellent" channel is 6 inches away.
Sent from my GT-I9100 using XDA App

Sent from my GT-I9100 using XDA App

Turn Wifi off for 10 seconds then back on and it looks like this...
Sent from my GT-I9100 using XDA App

you could try using those routers as repeaters, assuming that many people wont use the wifi. Wait, how big is your house? And do you really need three?

my house is about 2000 square feet but I live in japan where typhoon proof houses have 18inch thick rebar and concrete walls and floors...I have 3 routers, one on each floor wired with cat6 through conduits in the walls. Each router is on a separate channel (1,6,11) and they all work flawlessly as long as I shut the wifi off for several seconds. I just think its strange that the pic in post two shows that the closer router can be seen but its choosing not to switch in favor of the one that it originally connected to even though there is next to no signal.

You're not alone - Galaxy S2 wifi roaming isn't working
Wifi roaming isn't working on my S2 running 2.3.4 (stock Samsung firmware).
Looks like it's the same for others. Google:
"Issue 12649: WIFI roaming not working."
"you tube Hh2XXi4LQ1c"
(I'm not allowed to post links yet )
Waiting for ICS I guess.

It would be nice for galaxy s plus to get working wifi roaming.

I have the same issue on a Samsung Infuse running GB 2.3.6. Only way roaming works for me is brute force - either manually disable/reenable WiFi, or get far enough away from connected WAP that the connection drops. After either, a scan typically picks up the closest router.
I work in a building with a dozen or so APs, so a working roaming config would be very helpful.

Roaming roaming roaming
I use 2 APs that act as Bridge repeaters for my Sky broadband.
I cannot roam between them.
If I disable and enable wireless, the preferred access point is the last one connected, not the strongest signal. The only time I automatically get transferred to another AP is if the original is out of range.
Has anyone tried roaming with the new ICS official ROMs? Does this work?
Will upgrading my Modem to the latest version for Galaxy S2 (GT-I9100) help this?
Any answers to these questions would help greatly.
evilgrin78
Galaxy S2 (GT-I9100)

Galaxy S2 WiFi roaming *not* fixed with ICS
psychochicken said:
Wifi roaming isn't working on my S2 running 2.3.4 (stock Samsung firmware).
Looks like it's the same for others. Google:
"Issue 12649: WIFI roaming not working."
"you tube Hh2XXi4LQ1c"
(I'm not allowed to post links yet )
Waiting for ICS I guess.
Click to expand...
Click to collapse
I just got the OTA update to ICS (4.0.3) in New Zealand. Unfortunately WiFi roaming has not been fixed.
Come on Samsung, sort it out! I was thinking of buying a S3, now I might go for an HTC instead.

Mesh cell phone network = Walkie Talkie

Good day every one
Really long time ago I had an idea! But few other people had the same idea Other projects use WIFI for a connection but I am talking about actual cellular network (GSM).
The idea is: add a feature to an open source cell phone to be able to make calls without a network provider. The design will look like a computer mesh network.
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Think of every cellphone like a Cisco network router with dynamic routing enabled.
Each phone will be aware of the presence of other phones and will have route table to every single one. There is no centralized server sort of like peer to peer.
When a user wants to make a call, then the cellphone will display the devices that are online and can be reached.
Look at the picture above and notice that there are more than one route to each device. Having many phones like that will increase the coverage!
Now does anyone know how to implement a such thing?
Maybe use android phones? Since OS is open source maybe it is possible to add this into it?
What do you think?
Reading materials:
http://www.cisco.com/en/US/docs/wireless/technology/mesh/7.0/design/guide/MeshAP_70.html
http://en.wikipedia.org/wiki/Mesh_networking
http://www.opencellphone.org/index.php?title=Main_Page
http://ipod-iphone.blogspot.com/2008/07/neo-freerunner.html
http://www.physorg.com/news198298057.html
http://www.servalproject.org/
http://bigthink.com/ideas/26480
http://www.freekorea.us/2011/02/20/...y-to-bring-cell-phone-service-to-north-korea/
http://www.psfk.com/2010/07/cell_phone_network_that_doesnt_need_towers.html

I dont think its practically feasible..
And moreover You cant use Service Provider's cellular network just like that ( and that also free)

man u realy want to learn how cdma, gsm,edge,2-4.5 g networkz work. and whatz a mobile handset realy do when its connected to a network.
send from my hd2 @ dorimanx v.3.0.0.rom,with 2way rec kernal.

I think Serval Mesh is what you want
EDIT : oups, already in your list...
amritpal2489 said:
You cant use Service Provider's cellular network just like that ( and that also free)
Click to expand...
Click to collapse
The idea here is to create an independant cellular network, using only the GSM equipment of phones, without using the service provider network.

sounds like a great idea, i would want something like this for sure. but the only down side is that you could only make a call for as far as the network broad casts which means in a small town it would really suck.

Nice idea but very costly.
Sent from my Galaxy Ace using Tapatalk

That's an interesting concept, but from what I understand, to make a call without an operator, both phones will have to be connected to the mesh network, right?
That situation would be rather rare, it's like making a video call between two iPod touch (that don't have a cellular network). If the other side is not connected to WiFi at the moment, the call won't go through.
Also something to think about is the battery life. If other people's calls would be routed through your phone all the time, it would drain the battery very fast.

The unfortunate bit to this idea is that, barring hardware,privacy, and feasibility constraints...If you implemented such a network, there would be no guarantee that you would be within the bounds of the network at any time. With current providers, there are rough estimates as to the coverage area that are fairly accurate, depending on exact conditions.
With this system, if a couple people in your neighborhood leave the town or country, suddenly, you have no service, or slow service.
It'd just fluctuate too much and wouldn't be reliable.

Phones hardware and closed-source software isn't designed to ad-hoc networking. IMO the closest available solution for that is this:
http://openbsc.osmocom.org/trac/

It is definitely an interesting idea, sorta makes me thing of "Ad-Hoc Networking for Phones". The only problem is, the phones would be limited to calls in their "network", so if you had 3 people in a desert, they could call each-other, but would be otherwise sunk
The problem though lies in that it would basically use your phone to power everyone else's phone service, and that would mean that your precious phone would be crunching data all day long, and eating batteries like they are going out of style (Not that it doesn't already).
So while in-theory you could get cellphones to all link up in a row and make a cell-to-cell network, latency would increase exponentially the more phones you have to "hop", and battery life would decrease.
Good thinking, but you would be better off starting your own cell network, and not charge outrageous prices. I am sure that we would all be happy to switch if you had good coverage and reasonable service

Nice idea hoping network providers would agree to implement such network feature.
But on the other side, it's far way impossible. For sure network providers would not allow that because it's some sort of a hacking over there frequency.
Not like Walkie-Talkies or CB Radios (Civilian Band Radios) where they operate at there own frequency with there own cell site for CB Radios.
I think the only way to make it possible is to hack the phones frequency and make it adjustable and add a unique ID for each phone. i.e. just like how the SIM Cards work. Once the frequency is hacked, then it is possible to control the transmitter.
Anyway, this is just my own IDEA, correct me if im wrong.

Nice idea,
How about openBTS ..? openbts,sourceforge,net
what different..?

I really have been thinking anout the same thing.somehow its gonna crack.

neat idea. although i agree with above posts,
battery would be an issue.
what if someones phone dies?
also, i see privacy being an issue. sure you could encrypt the call or text, but you would have direct access to every device in between point a and b. what would stop some smart guy from finding a way to invade your device. or write some malware that would run across the mesh. maybe i don't understand mesh networks well but it seems like a concern that would be valid.
biggest issue i can see is reliability. there are way to many variables for this to work out of heavily populated areas.
some kind of closed demonstration would be cool though

The problem with this is the modem/radio firmware is closed. It would be totally possible if we can get proper source for the modem/radio for each targeted device.

The battery drain would be tremendous. however this may be implemented in the form of an app or a function in android which can be switched off when not needed. This would also address the network congestion issues in crowded places. The more handsets the better.

It's an interesting idea, but has limits
If we thought about creating a new phone for this new network so that we weren't restricted by current cellular standards or architecture, it could be a good idea. The number of clients that the network could support via RF would be limited, however, because of the amount of signalling necessary between peers in a P2P environment and the fact that RF is broadcast, not point-to-point. Therefore, in order for peers to be able to hear each other over a reasonable distance, there would need to be a limit on the density of the mesh's population. In the current cellular topology, this limit is quite high because each handset only needs to communicate with one tower at any one time. In a mesh topology, each handset would have to communicate with a bunch of others in order to maintain the mesh and do the work of moving data through it.
So, this sort of topology is well-suited for low-density environments, but not so low-density that a handset can't communicate with at least a couple of other handsets. Also, at least one of the handsets would need to be able to communicate with a base station so that the whole mesh has access to the global comms network.

It's possible.. but impractical in a few cases.
I could understand in a densely populated city.
But what would the effects have on the radio usage?
"there by also the effects on battery life"

You'll find a nice video introduction into creating your own GSM network when Googling "CCC gsm network" and look at the 3rd link (I'm not allowed to post outside links). This should allow you to understand some of the GSM related technical terms on the OpenBSC page. I'm not sure if the guys from the video are the same people running OpenBSC.
I think that VoIP would be more interesting for you. Since it's really easy (NAT-ing can be nasty if you use multiple clients) to implement and you can use it over WiFi (generally internet).
So you could install a VoIP server at home accepting phone calls and forward the calls first to your mobile phone via WiFi when the phone is connected to your WiFi, otherwise the call can be forwarded via WiFi. You should even be able to use your VoIP Server at home to forward a call from your mobile phone over the internet to another phone number.

I think this is one of those pie in the sky ideas. While it sounds great there are some huge challenges. First and foremost the radio in your cell phone is locked down and you don't have the access that you need to be able to do that. The second issue is security. Routing voice would be fine but routing data, you pretty much have the worlds easiest man in the middle attack. The third issue is spectrum. Cell phones use RF spectrum that is bought and paid for, as in we can't use it otherwise the FCC could fine us lots and lots of cash money. And like others have said battery life would be awful.
I think there is a potential solution here though. Purpose built hardware. I know that some of the Ham bands are pretty close to the cell phone bands (close enough to work with cell phones). We could design a piece of hardware to act as a tower and we could start our own network. Using the internet as a backbone.

Xperia SP faulty wifi indicator + wrong wifi indication

Hi all,
This morning I was investigating the common wifi issue on our phones. We all know some devices have this issue.
I did a small research with the app Wifi Analyzer and I found this small "bug"..
In systemUI (statusbar) you have the indictors for wifi, nfc, bluetooth, mobile network, time.
When you connect to wifi you get an ammount of bars. I discoverd the following:
(please focus on the statusbar)
Both phones use 4 bars (dot included) to indicate the wificonnection
First picture is from my Samsung Galaxy S Plus Running latest Stock Gingerbread 2.3.6
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The second picture is from Xperia SP running latest stock 12.0.A.2.254 (non rooted)
BOTH PHONES WERE ON THE TABLE APROX 2 METER FROM OUR WIRELESS ROUTER!
For some unknow reason the indictator tells a diffrent story than the app Wifi Analyzer..
To be honest i think we all get fooled here. Both phones are having (in my case) a decent but not perfect connection and my Sony still thinks it is a crappy one. ( The option avoid bad connections is off in my case)
So perhaps this is also a bug in Sony roms?
Regards

mrjraider said:
Hi all,
This morning I was investigating the common wifi issue on our phones. We all know some devices have this issue.
I did a small research with the app Wifi Analyzer and I found this small "bug"..
In systemUI (statusbar) you have the indictors for wifi, nfc, bluetooth, mobile network, time.
When you connect to wifi you get an ammount of bars. I discoverd the following:
(please focus on the statusbar)
Both phones use 4 bars (dot included) to indicate the wificonnection
First picture is from my Samsung Galaxy S Plus Running latest Stock Gingerbread 2.3.6
The second picture is from Xperia SP running latest stock 12.0.A.2.254 (non rooted)
BOTH PHONES WERE ON THE TABLE APROX 2 METER FROM OUR WIRELESS ROUTER!
For some unknow reason the indictator tells a diffrent story than the app Wifi Analyzer..
To be honest i think we all get fooled here. Both phones are having (in my case) a decent but not perfect connection and my Sony still thinks it is a crappy one. ( The option avoid bad connections is off in my case)
So perhaps this is also a bug in Sony roms?
Regards
Click to expand...
Click to collapse
From what I've read in the past, there is no industry standard to what "one bar" actually means.
That is for the phone network signal though.
I assume there is no standard for Wi-Fi bars either

yo-meister said:
From what I've read in the past, there is no industry standard to what "one bar" actually means.
That is for the phone network signal though.
I assume there is no standard for Wi-Fi bars either
Click to expand...
Click to collapse
Which is my conclusion here. When you see only the dot in your status bar. It does not mean it is a crappy connection

It shows that xperia sp wifi cannot catch the signals properly... maybe

Wi-Fi is intermittent, buffering, dropping connections...

Hey Guys,
I'm currently on the Nexus 5 Experience Stock Kernel - Release 2.4.1 ROM: http://forum.xda-developers.com/showthread.php?t=2545838, I've tried flashing other kernels such as Francos and a few others but my issue is still around...
Basically the phone can't keep an active connection for long at all, I could be sending messages over whatsapp and it doesn't appear to send but then suddenly It shows that it's sent and the other person has replied...
Loading webpages can take several attempts, refreshing facebook can take several attempts and occasionaly when I look at the tiles the wifi tile is different color (reconnecting to the router) but the wifi in my place is very stable, fast and should work fine... I switched back to Paranoid Android for a test and the wifi works fine on it...
My wifi is awful on all of the 4.4 ROMS, anyone know why and anyone know how to debug and fix?
Thanks

You should flash this zip or add the line to your file by the root app, like root explorer...
gDataInactivityTimeout=200
Click to expand...
Click to collapse
in WCNSS_qcom_cfg.ini.
http://forum.xda-developers.com/showthread.php?t=2300873

keb00 said:
You should flash this zip or add the line to your file...
http://forum.xda-developers.com/showthread.php?t=2300873
Click to expand...
Click to collapse
I flashed that before it did nothing, I also tried someone else version (had different modified lines)

In that case the only way to fix that is change the kernel or the entire rom...
But wait for "insider" users, did you reported in the rom topic?

keb00 said:
In that case the only way to fix that is change the kernel or the entire rom...
Click to expand...
Click to collapse
I've tried over 10 kernels, over 10 ROMS including 100% stock and even tried different radios / bootloaders but the only thing working for me is 4.3 and lower...
It couldn't be a router setting could it?
Wifi Settings:
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Anyone got any ideas about this?
I've tried changing the wifi band to 2.4 and change the region code to Europe, tried wifi optimization on and off but still it's awful

Do you have similar performance issues with other wireless devices when using your router? If so then it likely is a router problem. Does your router have an 'auto' mode for channel or is there a reason you're using 6.

DrFredPhD said:
Do you have similar performance issues with other wireless devices when using your router? If so then it likely is a router problem. Does your router have an 'auto' mode for channel or is there a reason you're using 6.
Click to expand...
Click to collapse
The wireless works perfectly on laptops, other phones (Samsung S2, HTC Desire Z...etc), I'm using channel 6 as in the other part of the house the wireless there uses Channel 1 and the garden uses channel 11, (odd shaped house means parts of the house wouldn't get wireless if I ran them through one router)
I can try changing them all to auto but I doubt it will make a difference.

Hyflex said:
The wireless works perfectly on laptops, other phones (Samsung S2, HTC Desire Z...etc), I'm using channel 6 as in the other part of the house the wireless there uses Channel 1 and the garden uses channel 11, (odd shaped house means parts of the house wouldn't get wireless if I ran them through one router)
I can try changing them all to auto but I doubt it will make a difference.
Click to expand...
Click to collapse
All three on auto and still the same issues, turned two of the extenders off and just ran it like a normal setup and again the same issues
Anyone else got any ideas?

Tried another ten roms with and without custom kernels, all give Me the same problem

Wi fi issues!
The same things you described also apply to my case!! I expected that new radio or kit kat kernel would solve wifi issues of my nexus 4 but nothing. I have tested also various kernels-roms-fixes but the result is always the same. I compared every new configuration with my nexus 7 2013 and it feels disappointing!!! wifi speed 1.5Mbps for Nexus 4 10.5Mbps for Nexus 7! The only thing I have noticed is that I can achieve 10Mbps also with nexus 4 when I change small settings such as set to 2.4Ghz channel and disable wifi battery optimization.. Speed is improved instantly up to 10Mbps but it works only for some minutes. After that it is the same bad speed / bad signal reception / weird behaviors among different routers!! nothing of these happen with samsung phones!!
Almost bad signal reception also applies to my Nexus 7 2013 depending on the router!! I am very dissapointed with nexus devices! I bought them mainly due to the fact that google used to support its products.