Vodafone landline vs. Other landlines?

I am wondering if anyone can tell me how to differentiate vodafone and other landlines. I'm planning to get the new TALK plan by Vodafone that allows me to call NZ Vodafone mobiles or landlines for $12. How would I know whether the landline number is Vodafone? I just don't want to lose my credits unneccesarily...& I don't have landline so would be great if anyone could help me out. Was planning on getting the plan to call up companies if they have jobs available, so it's not like i'll know if they are using Vodafone or Other suppliers.

Please help! Would really appreciate it!
 
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