Writing FPLMS to SIM

Hi all Somebody mentioned recently (at osmodevcon was it?) about writing to the FPLMNS list to avoid service loss due to LUR reject cause 11 (I think?) I notice we don't seem to have this an a option in pySim-prog.py, so I am wondering what tool was used? Thanks! (I noted the commented FIXME section for HPLMN in pySim.read.py and from there was able to modify read address and read and decipher the FPLMN list, although i did not get a nice readable output format yet.)