Re: [Openbts-discuss] why my cell phone close to Openbts then the cell phone can not register to real network?

[John Wu <jw...@gm...>]

On Thu, Mar 17, 2011 at 2:07 PM, David A. Burgess <dbu...@jc...> wrote:

> John -
>
> Oh my!  I don't mean to criticize you personally or particularly here, but
> this is important information to repeat sometimes and I hope lots of people
> read this.
>
> You are doing at least one Very Bad Thing here and, from your reported
> results, probably two:
>
>  1. You were probably testing in a band that is used for public cellular
> service in your area, like 900 or 1800 in ITU regions 1 or 3 or 850 or 1900
> in ITU region 2.  That is Bad.
>
>  2. You were spoofing your local public network.  That's Especially Very
> Bad.
>
> There are numerous posts in this mailing list warning against these things.
>  There are also specific instructions in the public wiki warning against
> these things (like this:
> http://gnuradio.org/redmine/wiki/gnuradio/OpenBTSMS_Camping).  The default
> configuration is MCC=001 MNC=01, a test network.  You should not have
> changed them unless you were absolutely sure what you were doing.
>
> So now your phones' SIMs "remember" that they cannot get service in your
> network.  The problem is that your network is identical to your local public
> carrier, so they don't bother looking for service there either.  Oops.
>
> So, what now?  The only solution I can recommend is to power down every
> phone, remove and reinsert the SIM and battery, and power back up.  (And
> what about iPhones, where you can't remove the SIM and battery?  I have no
> idea.  I'll wager that a misconfigured BTS, regardless of the type, might
> well "brick" an iPhone.)  Anyway, if you are lucky, this battery removal
> procedure will fix everything.  There is a chance, though, that some SIMs
> will "remember" that the name of the network is now "OpenBTS" and they will
> may continue to show that name even after service is restored.  I don't have
> a good solution for that, but if you search the mailing list archives for
> the subject line "they want to kill me", you might find something useful.
>

It is not so critical. After I close Openbts all cellphone can register to
real network at present.

Thanks!


>
> -- David
>
> A postscript, and THIS IS IN CAPS BECAUSE IT IS IMPORTANT:  THE CELLULAR
> NETWORK IS MORE DELICATE THAN THE IP NETWORK. IT WAS NOT DESIGNED WITH THE
> EXPECTATION THAT RANDOM CIVILIANS WOULD EVER HAVE ACCESS TO NETWORK
> EQUIPMENT. THERE ARE FEW SAFEGUARDS AGAINST ROGUE ACTORS IN L3. DON"T SCREW
> WITH YOUR PHONE COMPANY; IT IS ILLEGAL AND THE THREAT TO PUBLIC SAFETY.
>  (Maybe someone should put that in the masthead of the public release just
> to be sure everyone who runs OpenBTS see it.)
>
>
>
> On Mar 16, 2011, at 8:29 PM, John Wu wrote:
>
> I set MCC and MNC the same with local GSM network, and LAC keep the default
> value 1000.
> I have tried the reject code with 0x11 0x0C 0x05 0x16 all with the same
> result.
> Once my cell phone is rejected from Openbts it will not find other BTS and
> just keep trying
> register to OpenBTS. And my neighbour's cell phone also have the same
> result.
>
> On Thu, Mar 17, 2011 at 11:11 AM, David A. Burgess <dbu...@jc...>wrote:
>
>>
>> What where your MCC/MNC/LAC and what reject code did you send?
>>
>> And have you tried power-cycling the phone?
>>
>> On Mar 16, 2011, at 7:58 PM, John Wu wrote:
>>
>> > I dont want my cellphone to register to openbts so I reject it in the
>> location update.
>> > but after that my cell phone do not register to real network. Is it
>> something to do with
>> > LAC NCC or NCC permited?
>> >
>> > Regards!
>> >
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>>
>
>