Access code and It’s importances in telecommunication

Access code stands for

an electronic serial number, mobile identification number, service access card, account number, or personal identification number used to acquire, receive, use, or transmit a telecommunication service.

source:definedterm.com

Importances of access codes

To get connection in to a specific region, access code must be entered before the phone number.
National access codes are used in dialing domestic numbers.
International access codes are used in dialing international numbers.
Even use of different access codes ,user may need to pay less in phone for international call.

In the context of Nepal,NTC has following International Call Tariff depending upon access code

For SAARC Countries

SAARC Countries (Rs. per min)
SN	Country	Access Code 1424	Access Code 1425/1445	Access Code 00
1	Bangladesh	4.00	12.00	12.00
2	India	2.90	6.00	12.00
3	Pakistan	8.00	12.00	12.00
4	Srilanka	12.00	12.00	12.00
5	Bhutan	15.00	15.00	15.00
6	Afganistan	24.00	24.00	24.00
7	Maldives	60.00	60.00	60.00

For other countries

Other Countries (Rs. per min)
SN	Country	Access Code 1424	Access Code 1425	Access Code 1445	Access Code 00
1	USA/Canada	1.75	8	8	30
2	China/ Hong Kong	3	8	8	30
3	Singapore	4	8	8	30
4	Thailand	4	12	12	30
5	Malaysia	6	8	8	30
6	South Korea	6	24	24	30
7	Macau	6	24	24	30
8	Israel	8	12	–	30
9	Taiwan	8	24	24	30
10	Japan	10	12	12	30
11	Russia	10	24	24	30
12	UK	4	24	24	30
13	Australia	7.75	20	20	30
14	Saudi Arabia, Qatar, UAE	12	12	–	30
15	Bahrain, Kuwait	8	12	–	30
16	Iran, Iraq, Lebanon	12	12	–	30
17	Cyprus, Sweden, Hungary, Finland	8	24	24	30
18	Germany, Netherlands, Spain, Denmark, Norway, Belgium, France	10	24	24	30
19	Switzerland	15	24	24	30
20	Somalia, Falk Land, Cuba, North Korea, Papua, New Guinea, Solomon Island, East Timor	–	–	–	80
21	Satellite Phone, Global Networks, Inmarsat, Iridium	–	–	–	240
22	African countries	30	30	30	30
23	Rest of the world except mentioned above	20	24	24	30