New Zealand voice number and US sms number.

Hi Richard. I am in the process of getting my website done for my new practice in Redcliffs Christchurch. It needs a landline number and I have purchased a New Zealand number for voice because its cheap enough and I have a US number (does voce and SMS) for sending SMS messages because the US is really cheap. Will this work. So far I have not been able to get the NZ number to dial my phone and I cant dial it. Any suggestions