Originally Posted by
Canarsie
iMessage can only be used if you have Wi-Fi or cellular data switched on, which I usually do not because I have unlimited texting at no extra charge; and the only time I activate cellular data is if I have no Internet service...
...and if I want to download anything onto my iPhone, I simply do it at one of my Macintosh computers.
I keep wifi on and cellular off, but I have 2gig of data, and it's not likely I will come close to using it, since almost everywhere I am has wifi these days, including my office, which has off-network service for guests and employee use on personal devices.
I switch on cellular when I want to get email when in the car. As well, I check email manually.