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Dario Lombardo dario.lombardo.ml at gmail.comOn Fri, Sep 7, 2012 at 6:02 PM, Brandon Creighton <cstone at pobox.com> wrote: > I've seen similar behavior before -- particularly trying to write > EF.PLMNSEL, EF.FPLMN, and EF.{O,H,}PLMNwACT on some US-carrier SIMs. > > This seems to be worse in the ones from AT&T MVNOs (I've tried ones > from Red Pocket and H2O). Generally, the write just fails; but I > believe I've observed some EFs get reset after a successful > write/read. Are you getting a valid response from the UPDATE BINARY > command? > My software doesn't give me any error. Unplugging and replugging the sim gives me good feedback: the test operator is still on the top of the plnm. > Unfortunately, I haven't found a reasonable workaround for this. One > ugly hack that seemed to work with some SIMs on an HTC One V (a recent > Android phone ), is "priming" the SIM by first registering to the > network using a old Nokia 3310 or similar; the connected data is > stored on the SIM (EF.LOCI, I imagine? I actually never figured out > why this worked.) and is good for a one-time use in the smartphone. > > Writable or custom SIMs are reasonably inexpensive, so for anything > over a handful of devices in a test network (with manual network > selection), that's probably the way to go.. > I tried to used expired sims because I have loads of them... :) > Are you operating as MCC=001 MNC=01 (test network)? > Yes. > (Apologies to the list if this is the wrong venue for this.) > > > On Fri, Sep 7, 2012 at 8:15 AM, Dario Lombardo > <dario.lombardo.ml at gmail.com> wrote: >> Hil list >> Today I've observed a strange behaviour when modifying the PNLM of >> some real networks expired sims (to be used with osmocom and openbts). >> I've put 001 01 on the top of the list. I've ejected and reinsterted >> the sim in the reader many times, and I'm sure that the value has been >> wrtitten. >> When trying to connect to my test operator I get the message "your sim >> card doesn't allow the connection to this network operator" from my >> android phone. >> Reading again the pnlm I see that the original list has been restored. >> This astonishes me... Is is possible that the SIM overwrites the list >> by itselt? Or is it the phone that does it? The android has an >> original, not branded, operating system. >> Thanks everybody for your help. >> Dario >>