I have a somewhat technical question about how handsets acknowledge that they are "roaming".
What is responsible for this?
I mean, I understand the general roaming process: phone connects to network, network checks user and finds that they're not one of their own, they find who the user is with and create a "temporary" profile for that user, which is then sent back with a bill to the actual carrier.
However, how does the phone itself know that it is roaming (for purposes of things like disabling data roaming)? Is it some sort of "token" sent to the device by the carrier? Is it done through the SIM card, which is locked to that one carrier and flags any other carrier under roaming? Is it something else entirely?
On a somewhat related note, what establishes the network's "name" that the user sees? Is it purely pushed by the carrier? Can the SIM card manipulate that field in any way (does it play a part in the process, or is it just playing the role of a dumb pipe)?
Hope this question makes sense -- I can clarify if need be!
(bump? =/)
Hello
Is it possible to have the same IMEI on two phones same model¿?
If so are the calls working and the internet connection also¿?
What could be the risk?
Thnak you in advance
I am a security network admin and this things interest me so please be kind and help me resolve my doubt
ovidio.catrina said:
Hello
Is it possible to have the same IMEI on two phones same model¿?
If so are the calls working and the internet connection also¿?
What could be the risk?
Thnak you in advance
I am a security network admin and this things interest me so please be kind and help me resolve my doubt
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Click to collapse
NO, 2 mobiles cannot have the same IMEI number. Every cell has a unique one. This IMEI number is very useful to block and trace a mobile phone if in case this is stolen....
if there exist same IMEI nos..that means the phone is cloned... and its not possible to make a call..because it gets blocked by your network provider itself!
Hello All,
For older phones you use to be able to access the mobile data connection strings that tells the phone how to connect to the network and initiate a mobile data connection for ie. allowing you phone to brows the internet over a mobile data carrier and not Wi-Fi.
I hope I've explained that well.
What I want to know is if there is a section in an android phone, maybe the developers section, that I can change so that the mobile data portion of the phone will not be able to connect. I'm not looking for the normal data on/off in the settings as that can be changed at will, this would be something that not just anyone would be able to access to change. I do have a programming background so I should understand what your responses are but just need some direction.
I'm not quite sure where to put this so I thought this place would be good but let me know if it is not.
Thank you in advance.
13I find myself with a few phones handed down to me, and I am often in areas where there in no mobile phone network available,
I am curious as to weather or not these Android phones (on which I have gained root access) could be perhaps booted to a system that allows communication directly between the phones instead of via the non available mobile network.
If I remember correctly, an article I read some years ago described an open source project designed to offer telecommunications using the transceiver in each phone to create a network for areas that had no other available network.
If anyone could point me to some information on the above described network, or just using these as "walkie talkies" I would very much appreciate it.
I was not able to find much in the way of relevant information, but Wikipedia says,
Developments
Some cellular telephone networks offer a push-to-talk handset that allows walkie-talkie-like operation over the cellular network, without dialing a call each time. However, the cellphone provider must be accessible.
Motorola has IDEN cellphones (e.g., i867) that can have 15 conversations over each of 10 900Mhz channels (see Moto Talk) between compatible cellphones without using the cellphone network or a base station. This is very useful outside the range of a cellphone provider as well as reducing network charges.
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Smartphone apps
A variety of mobile apps exist that mimic a walkie-talkie style interaction. They are marketed as low-latency, asynchronous communication. The advantages touted over two-way voice calls include: the asynchronous nature not requiring full user interaction (like SMS) and it is voice over IP (VOIP) so it does not use minutes on a cellular plan. Applications on the market that offer this walkie-talkie style interaction for audio include Voxer, Zello, and HeyTell, among others.[7] An application that offers this style of interaction for video is Glide.[8]
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Nothing in this seems to be what I am looking for.
have you tried restarting your phone? my phone sometimes crashes and restarting works perfectly, try it seriously
There may be apps that provide Walkie Talkie like functionality over Wifi, but I think you need to distinguish what you are doing over wifi, bluetooth, and cellular. I'd go with one of these. You might even be able to setup some kind of mesh-based network using wifi - depending on the area you are trying to cover.
iDen and other carrier based PTT solutions are based on connectivity to cellular networks, and won't help you here. Additionally, most GSM networks are not outfitted with native PTT functionality. You are best working with Local Area Networks (LANs, like WiFi) or Personal Area Networks (PAN, like bluetooth)
WiFi and Bluetooth operate on spectrum which is unlicensed and available for public use - with some restrictions, such as power output and the like. Anything you could coax out of WiFi or Bluetooth should be fine.
Cellular, on the other hand, is an entirely different breed. Cell networks are generally regulated and licensed by relevant government authorities. Trying to setup your own cell towers is likely illegal in most countries without licensing or regulatory approval - with a few exceptions, like carrier sponsored micro cells. That would include tampering with the cellular radios in most devices.
3234
Yes,,, the legal issue is something I had not yet considered and you make some important points.
It is likely that even if I find the information on the project I mention above I will not be able to do anything other than learn a little from it, that's OK.
You mention IDEN as being carrier based, as far as I can tell IDEN is one of the few that is not.
From my previous quote
Motorola has iDEN cellphones (e.g., i867) that can have 15 conversations over each of 10 900Mhz channels (see Moto Talk) between compatible cellphones without using the cellphone network or a base station. This is very useful outside the range of a cellphone provider as well as reducing network charges.
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There is more info on this at this site .wikipedia.org/wiki/MOTO_Talk ( need to make more posts before I can give a link ).
I do however note that some carriers do not allow this feature to be used, or limit its use.
MOTO Talk also works only on some specific Motorola phones, reading between the lines there seems to be some hardware as well as software that is unique to these models.
I'm most interested in the open source project ( I think it was open source ) that I read about some years ago, perhaps it is on SourceForge?
I have trouble finding a useful search string for Google, any suggestions?
Will a rooted device work on both CDMA and GMS cellular networks?
My cellular provider is Visible which uses Verizon networks. There are phones that hat work on the Verizon network, but Visible won't allow me to use them.
Is the IMEI number the only way they can tell what phone I'm using?
Is there a legal way to change the IMEI number or make them think I'm using an "approved " device? (I think this is called ghosting)