I was gonna post this exactly after I read the OP. Feel free to go on wifi hotspots for casual browsing, youtube, pandora, IM, etc. You're a mook if you give up personal information.
You could write it on a piece of paper and put it in between the case and phone
I'm sure there's another app that does it too, I don't know one right off hand(maybe a launcher or locker app)
After seeing what a resource hog AVG is I wouldn't even give them a chance on my phone. They weren't horrible when they started, but after the link scanner and all the other add ons came it got ridiculous, even when you try to disable the extras. Avast runs two processes that take 1/20th the memory the 7 AVG processes running took, oh and it catches more.