我想問由香港打去四川要打咩字頭先得...急用!!..thx

四川 成都 area code is 28 , 四川 重慶 area code is 23 .

China country code is 86.

It means in HK, you should dial 001 86 then the area code then the telephone number.

Check out this page for the telephone area code of the cities in China.
http://www.singtaoetel.ca/CH/NeiContent/areacode_mchinia.php

(this page assume you are in China, so, if you call from HK, should use 001 or other IDD that you have)

四川成都：028，天津市：022希望可以帮到你啦