How to get iphone 4 service without 3G?

Just got a brand new 8gb koodo iphone 4 and the only way I can get service is with 3G on. How do I fix this?

If you're talking about service as in calling and text messaging you should't need to have your celullar data on to be able to make calls and send text messages. Now, if you're talking about service as in internet and data then… You obviously need the 3G to use it. If you don't want to use your data then you can simply turn it off by going into settings > general > cellular > celullar data > off and connect to a wireless connection. This will restrict all data to Wi-Fi, including email, web browsing, and push notifications as explained. If this did not help them I'm sorry but I have no idea what you're trying to do. Your welcome x