Final Sale, No Exchange, No Refund.
Call from China Mainland:
dial 17900-->choose language option --> account number + # --> password +# (account number and password are separated by a "#" in your pin number.
For example, your pin number 1234567890-1234, the 1234567890 is account number, and 1234 is your password) --> destination number
to call a landline in China Mainland: 0 + area code + number;
to call a cell number in China mainland: 0 + cell phone number'
to call other countries out side China: 00+ country code +city code +number