I will update my phone to an iPhone 6 Plus. I currently own an iPhone 4s. Recently ATT lunched a promotion to upgrade its shared data plan to 30gb per month. I have the unlimited and after 3gb I get my data throttled. Shall I update (change) my data plan from the unlimited to the 30gb family shared data plan? P.S. My wife only does web browsing and some pandora mostly at home with wifi.