Hi DS, > My main concern was that > if you were to use eg. T-Mobile's 310-160, then other GSM phones > with a T-Mobile issued SIM card would be at risk of inadvertently being > connected, for example someone driving by.
Unless you or someone else on this list can present a strong argument for a different choice, I currently plan on using 310-222 as my made-up PLMN code - the important point is that the last digit of the 3-digit MNC is not 0. All of those legacy codes like 310-160, 310-220 etc have zero as their last digit; none of those MNCs are used any more (there is only 310-260 for T-Mobile and 310-410 for AT&T, with the latter having no GSM cells, only LTE crap), but I have no desire to misrepresent my Themyscira Wireless operation as an old, no-longer-used T-Mobile PLMN - hence I am picking a 3-digit MNC with a non-zero last digit, which has never been assigned to anyone. How did I come up with 310-222 as opposed to some other code? A long while ago, before the scamdemic, I was thinking of 310-666, just to poke fun at silly religions - but in the new reality we live in, my new friends are the pureblood community (those who have NOT taken poison injections), and most of them are conservative Christians - hence I changed my mind to using 310-222 instead of 666, to avoid giving them the wrong impression. Our FCSIM1 cards do have EF.PNN and EF.OPL, and I have these lines in my fc-simtool programming script: pnn-write 1 Themyscira opl-write 1 310-222 0000 FFFE 1 opl-erase 2 end With this programming, phones with Themyscira SIM cards inserted into them and connected to our Themyscira GSM cell should actually show "Themyscira" on the display - but some really old firmwares (I suspect Pirelli's fw may be one of those) ignore PNN/OPL from the SIM, hence those will display "310 222". > The risk would be much lower > with a test PLMN; since it is not their HPLMN, passers-by's phones > would have no reason to attach. How would the situation be any worse with 310-222? This code will never be anyone's HPLMN nor will it appear in anyone's PLMNsel, as it is officially a "does not exist" code, thus I don't see why any passerby phone would try attaching. Also needless to say, I will configure my network to reject any registrations from IMSIs other than our own - I am NOT copying Rhizomatica's way of running with alien SIMs. > Also, I would recommend looking at > the available spectrum with osmocom_fft plus an SDR such as: > https://www.nooelec.com/store/nesdr-smart-xtr-sdr.html; Why SDR, why not use a traditional spectrum analyzer instrument? So far I've been using the SA function in my CMU200, with a suitable antenna on the RF4 IN port (the input-only port for weak signals), and it's been working great for looking at both PCS1900 and GSM850 bands. > and mapping the existing base stations with gr-gsm. A map of existing GSM base stations would say almost nothing about spectrum utilization: there are very few GSM signals left around here, while most of the spectrum in the two traditional cellular bands is taken up by non-GSM signals for sheeple smartphones. The picture becomes very clear when looking at my CMU200 SA display: the few narrow peaks produced by the few remaining GSM cells are clearly visible, and so are the wide swaths of sheeple brainwashing emissions. > In this way you can pick an > ARFCN that has the lowest chance of stepping on the toes of an > nearby base station :-) I already did this analysis, but I will boot up my CMU200 and look at the spectrum one more time, to make sure that nothing changed, before I fire up my BTS. M~ _______________________________________________ Community mailing list Community@freecalypso.org https://www.freecalypso.org/mailman/listinfo/community