Mobility
terminal
internet
access
IMSI
routing
coverage
roaming
global
handover
switch
seamless
SIM
operator
PSTN
billing
tariff
accounting
GSM
AMPS
900
1800
CDMA
TDMA
WB-CDMA
HLR
MSC
BSC
BST
AUC
SMSC
Voicemail
VMC
IN
Camel
IOT
NNT
UMTS
multimedia
TADIG
IREG