User's Manual

page 34
PIN2 Personal Identity Number 2. Supplied by the network operator. Used
when specific functions are to be performed, such as protected FDN
function supported by SIM card.
PUK Personal Unlock Code. Supplied with SIM card. It is used to unlock
the SIM card if you input wrong PIN code for three consecutive times
and the SIM card is locked. You can also use it to modify PIN code.
PUK2 Personal Unlock Code 2, supplied with a specific SIM card, and used
to modify or enable PIN2 code.
IMEI International Mobile Equipment Identity code, consisting of 15 digits.
One mobile phone corresponds to one unique IMEI.
MCC Mobile Country Code. China（mainland）is 460, for example.
MNC Mobile Network Code. China Mobile is 00, and China Unicom 01, for
example.
Call waiting A service provided by the network，which allows you to answer
another incoming call without interrupting the active call, but it is
different from conference call. You can only talk to one party while
another party is held at the same time.
Call diverting A service provided by the network, which allows you to divert an
incoming call to a specified number according to different
circumstances. Normally options of "Divert all voice calls, Divert if
unreachable, Divert if no answer, Divert if busy, Divert all data calls"
are available.
Roaming Refer to the phone not used in the area of its local registered network.