Moin, Am Fri, 14 Dec 2007 16:04:35 +0100 schrieb Torsten Schlabach:
> > It is called Certification or Approval. > > I see. In Germany AFAIK this is the Bundesnetzagentur, formerly known > as RegPT (Regulierungsbehörde für Post und Telekommunikation, just > for the non Germans on this list). And I know that each country has a > similar authority, which is in charge or regulating and licensing the > use of radio spectrum as well as making sure that devices which use > radio frequencies do not cause other users any trouble, etc. Yes, and also look to the fact that GSM is an incredibly brittle protocol which is only still working because not everybody can fool around with their handset's innards. You know those guys who would go to great lengths for 'boosting' their Wifi AP's signal even though doing so accomplishes nothing but blurting trash into neighbouring channels. GSM is even worse. For example there are flag bits in there indicating that you're an emergency worker and need access to the net even when the general public is barred (e.g. in states of emergency). I guess it's also very likely that you could bring down fairly large areas of coverage by blurting out the wrong bits over the air (fuzzing anyone?). For more hands-on work I'd recommend http://wiki.thc.org/gsm > > And since the SIM card plays a crucial role in that, it is simply > > not possible to access the SIM card directly by software. No > > manufacturer in this world can change that. > > I doubt this is acurate. Right, there are even AT commands for limited SIM access through the modem (AT+CSIM and AT+CRSM), though expectedly you can't do anything fun with them. Now on to your point: With the Neo1973 you can at least have some part of your wish: You get all the information needed to do hardware modifications. While it's true that the SIM card slot in the Neo is connected directly to the modem that doesn't mean you can't do something with it. In principle it should be possible to connect the SIM slot back to the CPU, e.g. by using a SIM sized adaptor (like http://www.runningserver.com/img/thelab_chipcardlab_chipcardlab.jpg bottom right) and some spare I/O lines (look into the Wiki if there's anything, or ask around, ask roh if you can't find anything). You should be able to mostly emulate/relay a SIM card in software with this method. Why you would want to do that is of course a different story. > One hot application these days is dual-SIM phones. Many people have > several SIM cards these days to use in different networks for various > reasons, but there's nothing wrong with that I think. But people > don't necessary want to carry 2,3 or more phones. IIRC you'd need dual radios for that anyways. -- Henryk Plötz Grüße aus Berlin ~ Help Microsoft fight software piracy: Give Linux to a friend today! ~
