Develop Bugs

Query: Simultaneous GPRS data transfer & Voice call

I have an MDA C3. When web & walk is transferring internet Data and a call comes in, the phone does not ring. It goes directly to the voicemail.
T-Mobile customer service tell me that this is correct as you can either transfer internet data or make a call.
Is that right? I thought that was with WAP which is analagous to dial-up. Surely GPRS is analagous to Broadband.
Anyone else want to try this:
Go to Web & walk home page. Attempt loading up the guardian page (This will take a while). Whilst this is loading, call your phone number and see if it rings or goes direct to VM.
I spend lots of time browsing so I must be losing lots of calls!
Feedback greatly appreciated.

From what I have heard only UMTS devices can support simultaneous voice/data.

Yes - but not GRPS that uses GSM band instead of UMTS.
However, some devices have troubles keeping the data link active when a call comes in.

I am having the same issue (also on T-Mobile UK).
Then IE is running or AS is downloading my mail (I use direct push) all my calls go straight to voicemail.
This is worrying as I just moved over to T-Mobile for the web n walk package to allow me to have instant e-mails. This is a pain if it means I miss calls whilst my mail is downloading.
You'd think that the chances of the 2 coinciding are slim (I don't get a lot of mail, maybe 10 per day) but the wife has already complained 3 times since Friday that she went straight to voicemail, and each time it was exactly as i got a new mail.
Is this a limit of GPRS, the Orbit or just T-Mobile?
Thanks
Dae

I was surprised too... Thats why I posted the query. I thought my phone and/or SIm were faulty. But T-Mobile tell me thats how its supposed to work.
With W&W and Email, Its really hard for someone to get through with a voice call. It was worrying for me as I tend to browse the net whenever I am waiting around. This means that when I am on the bus surfing, no one can get through to me!!
Surely if there is a limitation, then the phone should give precendence to the Voice call. After all, you can pick up your emails or surfing where you left off.
I would really be interested to see if this is a T-Mobile only problem.

No itschase is spot on.
It's not a t-Mobile problem, it's the same for any GSM based network.
Only 3g (UMTS) phones can do data and voice at the same time. No matter what network you are on.

I have just run an experiment in the office as follows:-
Me (artemis with v3 black and blue) - Voicemail when data active
person 1 (MDA compact III - v3 black and blue) - Voicemail when active
person 2 (hermes) - no Voicemail when active.
We are all on t-mobile UK, and therefore it doesn't look like a network issue, but maybe a ROM problem?

daesimps said:
therefore it doesn't look like a network issue, but maybe a ROM problem?
Click to expand...
Click to collapse
What problem? Everything is working as it supposed to. If it's so important to you. Go buy a 3g phone!

I now fully appreciate that 3g phones are the only ones to support this type of behaviour.
I was trying to be helpful and post the results of my test as at that point I didn't realise that only 3g phones worked as such. I was lead to believe this by wikipedia:-
"Class B
Can be connected to GPRS service and GSM service (voice, SMS), but using only one or the other at a given time. During GSM service (voice call or SMS), GPRS service is suspended, and then resumed automatically after the GSM service (voice call or SMS) has concluded. Most GPRS mobile devices are Class B. "
Obviously this is not the case.
Bring on the HTC Kaiser!!!

Gajet said:
What problem? Everything is working as it supposed to. If it's so important to you. Go buy a 3g phone!
Click to expand...
Click to collapse
I incorrectly assumed that whilst browsing, if a voice call comes in, the phone would give priority to the call.
If I had known what I know now at the time I signed my 18M contract I would have bought a 3g Phone! Its just annoying that i'm stuck with it for another 12M. T-Mobile push the fact that they have set the internet free... but what they fail to get across to everyday users is that its "AT THE EXPENSE OF THE VOICE CALLS"

Because T-Mobile forced you to buy one of their 2.5g phones rather than one of their 3g phones?

I have no problem receiving phone calls while browsing the internet on the P3300.

cduijker said:
I have no problem receiving phone calls while browsing the internet on the P3300.
Click to expand...
Click to collapse
Neither have I to be honest, the issue only arises while you are actively downloading data. However once the website has loaded, you are free to accept calls again whilst still looking at the site in the browser.

Gajet said:
Neither have I to be honest, the issue only arises while you are actively downloading data. However once the website has loaded, you are free to accept calls again whilst still looking at the site in the browser.
Click to expand...
Click to collapse
As a test I started downloading a dummy 32MB testfile on my P3300 (from speedtest.bbned.nl) and I called my mobile with another phone.
There was no problem; I received the call while downloading the file.
Maybe it depends on the operator? I am in Holland on T-Mobile

daesimps said:
I now fully appreciate that 3g phones are the only ones to support this type of behaviour.
I was trying to be helpful and post the results of my test as at that point I didn't realise that only 3g phones worked as such. I was lead to believe this by wikipedia:-
"Class B
Can be connected to GPRS service and GSM service (voice, SMS), but using only one or the other at a given time. During GSM service (voice call or SMS), GPRS service is suspended, and then resumed automatically after the GSM service (voice call or SMS) has concluded. Most GPRS mobile devices are Class B. "
Obviously this is not the case.
Bring on the HTC Kaiser!!!
Click to expand...
Click to collapse
Hi,
It's not enough to have a class A (2G) device, but also DTM (Dual Transfer Mode/Simple Class A) support has to be active in the specific network, otherwise only 3G device on 3G network will provide Class A (simultaneous voice & data).
In fact, there are quite many models from Nokia during last year that support DTM, but as already mentioned, it's not enough.
FYI,
Zohar

cduijker said:
As a test I started downloading a dummy 32MB testfile on my P3300 (from speedtest.bbned.nl) and I called my mobile with another phone.
There was no problem; I received the call while downloading the file.
Maybe it depends on the operator? I am in Holland on T-Mobile
Click to expand...
Click to collapse
Is that an EDGE network ?

I got the Artemis with PV Black&Blue v3 ROM.
I can receive calls while pages are loading in IE.
I think this is a provider problem.
The phone provider has to intercept your GPRS connection and establish the GSM connection. Maybe T-Mobile just rejects calls while a GPRS connection/transfer is active.
A1 intercepts the page download and my call comes in.
When I pick up, the GPRS connection is closed completely. (not just pending)
So receiving calls while surfing is no problem for me with Austrian A1 provider.
Any other experiences?

Gajet said:
Is that an EDGE network ?
Click to expand...
Click to collapse
no, just gprs; no edge.

cduijker said:
no, just gprs; no edge.
Click to expand...
Click to collapse
...then it's no way you'll get simultaneous voice and data (class a).

Hide my phone from TMobile's network!

I like to use phones that tmobile usa doesn't carry because my internet plan will only work with normal phones and phones that tmobile doesnt recognize. Well, I'm using a tmobile dash right now cracked with kavana's rom and I'm wondering if I can change some system information in it that will make the network think that it's another unrecognizeable phone.
Does anyone know how I can do this?
THANKS

nbradford said:
I like to use phones that tmobile usa doesn't carry because my internet plan will only work with normal phones and phones that tmobile doesnt recognize. Well, I'm using a tmobile dash right now cracked with kavana's rom and I'm wondering if I can change some system information in it that will make the network think that it's another unrecognizeable phone.
Does anyone know how I can do this?
THANKS
Click to expand...
Click to collapse
Well let me see if I'm getting what you post....
You are basically asking some "magic (app)" so that T mobile doesn't recognize the actual dash. Not recognizing other phone will avoid paying more for your plan right?
This is what I called "Illegal polite undercover fraud request" from my point of view or I'm wrong ? This is not allowed here dude,

There is simply no way of cheating here. The contract (or payment) is identified by the IMSI (SIM Card) - not the device (IMEI) - and the traffic is identified by the APNs you set (GPRS settings). The IMEI of the device is completely useless in that regard.
You cannot cheat - that easy.
Operators are sometimes linking web-applications to the IMEI identifying the device type to optimize services in a device specific (e.g. MMS) way.
Changing the IMEI is simply
illegal
very hard to do and you will not find any service that will do it for you, neither at XDA-developers nor at those sites that deal with SIM Unlocking. They have the best knowledge of how to deal with the encrypted areas that safeguard the operators settings linked to the HW of the device.
If you could succeed to "fake" the IMEI to be of another device-type, some services that depend on the correct evaluation of this (MMS, other services) mail fail on your device because they do not match the real needs of the device.
If operators detect bogus IMEIs in their network, they may simply refuse to serve this device and you cannot log into the network any longer.
Spend your efforts on something more useful than trying to cheat the operator.

ok for the simple fact of using my brain and knowing how any computer system works.... yes. yes there is a way to make ur phone appear to be another its just not an app, it has to do with someting alot deeper... but that thats all im saying it is possible but immoral im sure.

tobbbie said:
There is simply no way of cheating here. The contract (or payment) is identified by the IMSI (SIM Card) - not the device (IMEI) - and the traffic is identified by the APNs you set (GPRS settings). The IMEI of the device is completely useless in that regard.
You cannot cheat - that easy.
Operators are sometimes linking web-applications to the IMEI identifying the device type to optimize services in a device specific (e.g. MMS) way.
Changing the IMEI is simply
illegal
very hard to do and you will not find any service that will do it for you, neither at XDA-developers nor at those sites that deal with SIM Unlocking. They have the best knowledge of how to deal with the encrypted areas that safeguard the operators settings linked to the HW of the device.
If you could succeed to "fake" the IMEI to be of another device-type, some services that depend on the correct evaluation of this (MMS, other services) mail fail on your device because they do not match the real needs of the device.
If operators detect bogus IMEIs in their network, they may simply refuse to serve this device and you cannot log into the network any longer.
Spend your efforts on something more useful than trying to cheat the operator.
Click to expand...
Click to collapse
Thanks dude for the explanation, I think this guy wanted that us start discussing the "changing IMEI" topic .

tutsuo said:
ok for the simple fact of using my brain and knowing how any computer system works.... yes. yes there is a way to make ur phone appear to be another its just not an app, it has to do with someting alot deeper... but that thats all im saying it is possible but immoral im sure.
Click to expand...
Click to collapse
Anything is possible if you pay the right people. Knowledge how to change the encrypted block consistently is rare and kept secret as those guys build a business around it.
But changing the IMEI is so useless imho - why waste time doing so? Especially as it will not even help you to get free calls or data transfer.

i know what OP is getting at. its similar to tzones. just go on to your tmobile account and change the phone to an old one that uses tzones such as the razor, if that doesnt work try going to a store and asking for that service by showing them an old phone. after the service has been activated all you have to do is change your network settings (internet2.voicestream.com) it worked for me for years, but sadly moved on to android which uses a 3g network. good luck.

Yeah - that's what I say:
you can configure services that are used on the network
but you cannot hide the device you are using from the network itself
Any messing around making things seem different than they are will get you strange behavior of application services - but it will not save you any money.

fliparsenal said:
i know what OP is getting at. its similar to tzones. just go on to your tmobile account and change the phone to an old one that uses tzones such as the razor, if that doesnt work try going to a store and asking for that service by showing them an old phone. after the service has been activated all you have to do is change your network settings (internet2.voicestream.com) it worked for me for years, but sadly moved on to android which uses a 3g network. good luck.
Click to expand...
Click to collapse
So, basically you have told him the secret . Does this save you money at all? or it doesn't matter.

Mr. Clown said:
So, basically you have told him the secret . Does this save you money at all? or it doesn't matter.
Click to expand...
Click to collapse
This an "APN" I talked about earlier. Operators have several for different intended services (e.g. internet), but they try to keep things simple and reduce the amount of APN recently (so finally you have only one).
Per APN (Access Point Name):
The IP routing may be restricted (e.g. only to the mail server)
Charging may be different (kb/$)
The use of certain APN is restricted to you user profile, i.e. not everyone can use any APN
Depending on how strict the operators are handling the last point and how close they observe the generated traffic per user you may occasionally be lucky to sneak through with your traffic.
Mind however that for all traffic the operators are logging the IMSI (SIM Card) that generates it - so also for prepaid cards it may suddenly happen that your money is gone for old bytes that have been found linked to your SIM.

[q] flashed the desire sprint radio and prl install

I successfully flashed the CDMA Desire with a Sprint Radio off the Evo. It's baseband 2.15.00.09.01
I also installed PRL 60677 from sprint. I also tried the Cyanogen MOD.
It's currently running the alltel ROM so I can get access to the dialing codes in the PRL but even though I flashed the RADIO and the PRL it still shows the network as alltel and it won't let me get access in menu>settings>Wireless networks>mobile network
I can turn it on. But it either seems to take a long time to turn off, or go off by itself, not sure which. But once its on it is greyed out and won't let me get access to it.
I thought maybe it was the PRI, but I don't see how that could be. Is there some sort of Initial Program Loader from alltel doing this can someone tell me why it won't pick up on a sprint network that I have for cdma like connecting or sharing a connection etc... and won't get off U.S. Cellular network?
I might just try flashing to verizon and see what happens just to observe. It should be a lot easier than flashing to sprint.
edit: I did change all the dialing codes to sprint in the ## menu btw. I used the codes from another sprint Phone.
EDIT: It also won't turn off always when I hit Airplane mode and constantly says "Turning on...." and won't give access when to "Mobile Network" when you hold down the power button and that menu comes up.

I used the original Stock RUU to switch back. It changed the baseband and everything else back and also got rid of my clockwork recovery in the process
The only thing it didn't change is the PRL. I had to redownload that and manually rechange the codes in the ## secret dialing menu's.
As far as I understand I will need to change the esn or have this esn to sprint to be able to get it working on a sprint network. It is very difficult thing to do so I will have to postpone this. I'm thinking there might be some code or something in one of the abstraction layers or HAL layers that is preventing you from changing the esn somewhow... not really sure but that seems like the best place for me to look as it is the interface between the software and hardware. The hardware is there and able to do it, so it must be the most basic software or HAL that is preventing me from doing it I am guessing. BTW this is not illegal. I own my phone. If anything it's illegal for someone to sell me crap that doesn't work the way it should because of bogus programming that's been put on my phone to prevent me from using it! And nikola tesla invented the radio btw where is the money and credit he deserves for this?!

Hey man,
I am trying to do something like this for my wife. I'll let you know how it goes once I get the phone. In the meantime, maybe this might help you?
http://forum.xda-developers.com/showpost.php?p=4199684&postcount=5
I know it's not quite the same - taking VZW phone onto Sprint Network, but I thought it might help you out.
I'll post my experience later when I get the phone next week.
Thanks,
-Marcus

Eloquence said:
Hey man,
I am trying to do something like this for my wife. I'll let you know how it goes once I get the phone. In the meantime, maybe this might help you?
http://forum.xda-developers.com/showpost.php?p=4199684&postcount=5
I know it's not quite the same - taking VZW phone onto Sprint Network, but I thought it might help you out.
I'll post my experience later when I get the phone next week.
Thanks,
-Marcus
Click to expand...
Click to collapse
I don't think that's quite the same thing. I read through the post and a lot of it didn't make a whole lot of sense. Generally you have to have a compabible esn with the network you want to use. Every carrier has a database of all the esn's that are registered and available to use their service. If you try to connect to their service their software will recognize the esn as false and not grant service even if you install all the correct radio's/basebands, PRL files, Firmware, etc... it just won't work because you don't have an esn in their database so you have no authority to connect to their network. So you have to change the esn. But it's not such a simple thing to change an esn. I'm guessing its written in hexadecimal somewhere in the registry, but maybe not. There are certain command sets like the Haye's command set that only apply to CPU or other hardware like modem/Radio. There is an RIL which communicates between a driver, the modem/radio, and the OS. I'm guessing the esn is communicated and retrieved by the RIL layer that communicates via proxy & a driver or in one other PPP protocol that apparently only communicates with the network at certain times suspiciously. That's because the ESN is apparently located in the radio/modem and people have successfully changed their esn by changing their modem and installing a different one. A modem is essentially an ultra small electronic radio. In the same way that a radio picks up signals out of the air and converts to sound, a modem picks up signals also and can convert to sound as well as internet data, text messaging, etc...

If your radio doesn't have the proper command sets it can not pick up on certain signals such as for example sprint 1900 MHz for a sprint radio/baseband version vs a 900MHz signal for a 900 MHz Verizon. Each carriers software might be set up to block the other carriers signals in certain ways. For example each carrier has roaming agreements with the other carriers so that when you go out of your host carriers network say from Verizon into Sprint then you can "roam" and still get coverage. Sprint in this case provides the coverage and therefore they have an agreement to use each others network to provide better coverage. They may also pay each other small fees to use their network. Roaming, carrier type, cell number, mobile network operator, ip addresses, etc... can all be preprogrammed into CDMA handsets through ## secret dialing modes. This only works on CDMA handsets or in CDMA mode on your phone (i.e. not GSM). Usually on HTC devices you press ##775# to update a PRL file which is the Preferred Roaming List. That is usually easy enough, but this may not always update all your phones programming and you may have to do so manually through other ## dialing codes such as Primary HA secondary HA MCC (Mobile Country code) MNC (Mobile Network code) etc... Even if you do all that though it serves no purpose if the esn isn't registered to the network that you want to use. Generally only Cricket and MetroPCs in the USA will register a CDMA esn to use on their handsets. All the other carriers like Sprint, Att, Verizon, etc... generally won't do it, hence you can't get CDMA service from them if you have a CDMA capable handset even if you update all of your files as there is a program that is run on behalf of the carriers that manually checks your phones ESN/MEID/etc... to see if you have the "proper Credentials" or authorization to use their network. In this case the authorization is given on whether or not if your ESN is in their database and that it aslo can be in their database but blacklisted or grey listed in the case of you have an innactive account and need to pay them to get it "white Listed" or if you have a debt on your account or the phone is reported stolen it may be "black Listed". Usually you can flash to Cricket or MetropCs fairly easily though and they will even do it for you for a small fee.

Tmobile troubles with minutes/txt.. help?

Hey guys,
I was using my dinc2 in Europe all year and it was great. No troubles there.
I did some research since i've come back to US, and learned that people have been able to use tmobile with their phones. I've only read about some troubles with data plans ... but i'm not trying to use data at all.
I simply want to buy the 1000 prepaid minutes for 100$ from tmobile and pop it in. My plans is to use Wifi with google voice (groove IP) pretty much everywhere, and use the minutes from tmobile only when i'm on the move.
I tried getting a friends tmobile SIM to work just to make sure that there would be no problems, and i failed. It simply doesn't recognize the service.
My phone is S-OFF, hdboot .97, clockworkmodded, and runs Skyraider Zeus.
Is it a matter of running the correct ROM?

rpn377 said:
I was using my dinc2 in Europe all year and it was great. No troubles there. I did some research since i've come back to US, and learned that people have been able to use tmobile with their phones. I've only read about some troubles with data plans ... but i'm not trying to use data at all.
I simply want to buy the 1000 prepaid minutes for 100$ from tmobile and pop it in. My plans is to use Wifi with google voice (groove IP) pretty much everywhere, and use the minutes from tmobile only when i'm on the move. I tried getting a friends tmobile SIM to work just to make sure that there would be no problems, and i failed. It simply doesn't recognize the service.
My phone is S-OFF, hdboot .97, clockworkmodded, and runs Skyraider Zeus. Is it a matter of running the correct ROM?
Click to expand...
Click to collapse
We have 2 DI2 and running both AT&T Prepaid and T-Mo Prepaid on it - no trouble with voice with Skyraider Zeus v1.3 or Nitsuj17's Stock Sense rom - APN settings for AT&T was auto-updated as I recall and being provisioned with a data bundle in the plan, it works. For T-Mobile, there are no default APN settings under GSM mode pre-loaded, but as you know, it's not required for voice & SMS to work on the DI2, you will get a "redirect" screen if you launch the browser to sign up for a data plan for it to work (and, that's indication of a working Sim card)
With the sim inserted & switched over to GSM, does it identify the "T-Mobile" network on the lockscreen or homes screen at all? after a reboot ? If you're running SR Zeus in Europe - then, there's no reason for it to not work here in the U.S.- recheck your settings for Mobile Network ...

Partial (Data only) carrier lock??

I recently purchased an HTC 10 US model from ebay, taking my chances given the low price tag. The phone is loaded with a Telcel OS version, though the seller advertised the phone as unlocked. Hardwarewise, everything has been working beautifully.
I just got an H2Owirelees SIM, activated, popped it in. Initially, when I tried to manually create an APN, it reported 'this user is not allowed to create APN profiles.'
The device later auto-updated with APN info sent from H2O. I can send and receive calls and text, but still no data connection. Under settings, Data is enabled but shows 'Disconnected.' No data connection at all, not 2g, 3g, 4g, nothing.
So I'm wondering if there is some sort of partial carrier lock, which is not allowing me to receive data connections. The phone's model no is 2ps6500, which should mean that I have the US version. I would initially get a system notification suggesting I purchase a data plan for my phone, which redirects me to Telcel's website, which is why I suspect some sort of carrier lock.
Any insights on this? I realize this is probably a situation which not many others are encountering, but hoping to resolve without needing to flash a different ROM.