I just recently switched my phone to a plan where I now have 300MB of data, I've never had or used data before this so I'm very new to how it works.
My question is, if I'm at home and my phone is connected to the wifi, will it automatically use that instead of my 3G? I just want to make sure my data isn't being used in the background even if it is connected to the wifi, or if I should turn it off when I'm at home.
(Also as a side question along with data I also have MMS now, does my data have to be turned on to use MMS or is that seperate?)
Any help is much appreciated, thanks!
*if its relevant to my question, I have an iPhone 4S and it's fully updated