2N Analogue UMTS gateway 2N SmartGate UMTS - Manual, 1699 v1.1.0 - Manual (Page 67)

SIM Card PIN protection 4.4
67
Automatic PIN Entering
You need not enter the PIN upon power up if it is stored in 2N® SmartGate UMTS –
it is entered automatically. This function is useful in case of power failure; 2N®
SmartGate UMTS is operable in a short time after power recovery without any
intervention by the operating staff.
Caution!
n One PIN entering option is exhausted by the attempt to enter the PIN
automatically upon SIM card or PIN change. If wrong, the automatically
entered PIN is cleared from the internal memory to avoid another false
attempt upon next power on. There are still two manual PIN-entering
attempts after such unsuccessful automatic entering. To prevent the
unsuccessful automatic PIN entering, delete or program properly the 2N®
SmartGate UMTS PIN using the PCManager in the case of SIM card
change.