I currently have the family plan for two Iphones (2G). my service plan is 700 min + unlimited night and weekends + mobile to mobile for $59.99 and second line for $9.99. both data service + 200 messages for 20 each. If I upgrade 2G to 3GS, basically, I only need to change $30 for data and extra $5 for 200 messages and keep my current calling plan. Am I correct?