Do I need to have 3G on to receive picture messages on my iPhone 4?
Normally I keep the 3G and data roaming and mobile data turned off on my iphone 4 because I only really use it on my wifi network. Sometimes I need to look something up when I am away from home, and I turn on the mobile data for a bit. The last 2 times I have done this, a picture message from a friend has come through as I turned on the mobile data, marked from days or weeks before. Why does it only come through when I turn on mobile data? Why won't it come through when I am attached to wifi?