Urgent question regarding telephone card > 생활/지역

Sorry for writing in English.

I cannot use Korean currently -_-;;

I bought Chinese telephone card a few days ago.

I tried to ring my home in Korea but it only says "This phone number is un????...... this time".

I just followed this instruction:

1. press access number: 0208 497 8888

2. Enter PIN number

3. press home number: 82 2 ******

Am I wrong or Chinese telephone card is always like this?

I need to use this card now TT

Does anybody know how to use Chinese telephone card?

Pleas help me.

Thanks.