Hi Kelly,
The number you are dialing looks right. Have you followed all the steps required for using the calling card? There are 3 steps generally required:
1) Dial a toll free or local access number
2) You are asked to enter a PIN number
3) You are invited to dial your international number (011 966 …)
Step 2 (entering a PIN number) is not required with many cards today if the call is made from a number you registered when purchasing the calling card. This is because their system will automatically recognize the registered number.
If you have been following these steps and still can not connect there is either a problem with the card or with the cell phone you are using to dial, namely the phone line could be blocked for dialing international calls. Try using another line to dial, or call your cell provider and ask them if you can dial international calls using a calling card. If they say that all is well call the calling card provider and tell them about your problem.
I hope this helps.
Dan