Definitions for the some mobile services

DTMF (Dual Tone Multiple Frequency)
DTMF is a signaling method useful for services such as phone banking and automatic answering.

International Indicator
When you enter a correct international phone number, add a '+' in the front of the number.


Network Service Operator
Your mobile phone is not usable until you have signed a service protocol with your network service operator. And a SIM card is required.


PIN (Personal Identification on Number)
This code authorizes use of your SIM card and its data. The PIN code is provided by your network operator. This code consists of 4-8 digits, and can be modified when necessary.


PIN2 (Personal Identification on Number 2)
This code authorizes using some special features of your SIM card. In some countries, the PIN2 code may not be provided by your network operator.


PUK (Personal Unlocking Code)
Use this code to unlock a locked SIM card. This code is provided by your network operator. Roaming Roaming refers to using your mobile phone when you are not within the area described in your service agreement.


SIM (Subscriber Identity Module)
Card It includes details of protocol, security information and personal phonebook.

SMS (Short Message Service)
The sending and receiving of a SMS message is carried out via your wireless network’s SMS center. This feature requires network support.

WAP (Wireless Application Protocol)
This is the specification specially designed for mobile communication devices. With WAP, your mobile device can access the Internet in a simple, fast way.