need to know the cell phone area codes for wellington new zealand?

Answer 1

Country code for New Zealand is 64, Moviles per se do not have an area code, only a provider specific code.
21 will be Vodafone, 27 is NZ Telecom. Landline Area code for Wellington is 4
e.g. outside NZ to Wellington: +64.4. ....
outside NZ to Vodafone: +64.21. ...
inside NZ Telecom mobile: 027 ....

Also see:
http://www.tnzi.com/internal.asp?cat=100005

Answer 2

The international access code for New Zealand is +64. The outgoing code is 00 followed by the relevant country code (e.g. 0061 for Australia). City/area codes are in use, e.g. (0)9 for Auckland and (0)4 for the Wellington region. Vodafone offers GSM 900 coverage in and around the main cities and popular holiday areas. Internet cafes are widely available.

Answer 3

I used to work for a cell phone company and the area code tells you nothing about the carrier. That is locked down to a specific region. However the three digit exchange *can* tell you who the "original" provider is. Meaning that if someone had a 456 prefix and Verizon Wireless owns that prefix, that means that phone number started with Verizon. But like someone else said, you can port your number from carrier to carrier. So just because that number started with Verizon doesn't mean that it still belongs to them.