Hello, in order to get your phone number on your new phone you will need to do a few things. You need to contact your service provider Vodafone, tell them you need to do an esn change. ESN stands for electronic serial number. They will then give you instructions to program the phone. Do not hang up with them until the phone is working and you have made a test call.
Also you must make sure the phone you bought is compatible with vodafone service. Vodafone should be able to tell you the answer to that as well.