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PIN2 (Personal Identification Number 2)
The code is an authorization code to access certain special field in your SIM
card. The PIN2 code does not come with your subscription in some country.
PUK (Personal Unblocking Key Code)
Used to unlock a blocked SIM card. This comes with your subscription.
Roaming
Use your phone when you are outside your subscription network area.
SIM (Subscriber Identity Module)
It contains subscriber details, security information and memory for a personal
directory of numbers.
SMS (Short Message Service)
Messages to be sent and received between the network service operator’s
message center to your mobile phone. To use this service, it must be
supported by your network.
INTERNET (Wireless Application Protocol)
A standard specifically created for mobile communication devices which give
fast and easy access to Internet information and services.
