[James Jordan <james.jordan.fun@gm...>]

The most possible reason is that the detach msg is not received by the network
may due to the signal not good. do this network always not perform
detach if your
device send detach msg?

On 1/30/11, Bogdan Alecu <b.alecu@...> wrote:
> Hello,
> It is know that for the IMSI Detach message you don't need authentication
> (at least for GSM). However I have noticed that this doesn't always work for
> all the networks. On one network that I tested it, although the detach
> message was sent, I could still place calls to that phone. The only
> difference between the other networks is that they've implemented 3G over
> 900Mhz for data (although the phone used is not a 3G one) and that they send
> broadcast info so the phone is in CBCH. As far as I know this shouldn't make
> any difference. I'm trying to understand what are the reasons for not
> working so maybe you could give me a hand on this. Thank you!
>
>
>
>