Thanks Loic. Unfortunately I can't give names / models of devices, we're consultants asked to investigate on defects by a couple of different manufacturers with similar problems, under privacy statements.
- SIM integration and contacts: in all cases severe electrical and mechanical tests have been carried on, and we identified a few situations where the products are in a very quiet environment.
- operator: four / five major European roaming operators.
- location: Italy mainly but also cross country while traveling.
After a first review of the statistics it seems to us that it may be the case of a wrong or dangerous init sequence in the java firmware; actually the only common point of the different models and clients is the origin of the java applications running there. Examining the sequence (power up, PIN command, first inits) nothing strange emerges and this is why i'm asking here if anything special should be taken into account based on similar experiences.