Hi Pix thank you for reply.
OK but how then with some phones if battery disconnected then battery connected again power ON the user has to re-set clock, but for other clock no need to reset clock and no less in clock time between battery disconnect and reconnect. This is just one function I note take place.
Also if MS not follow normal power down what happens with PIN management?
I see GSM02.07 say nothing about battery disconnect when MS still in power ON. So like not IMSI-detach take place and this also said in other thread at this forum.