You can print several ways via wifi. For the apps: you can start by looking in the store to see what the printer company you have offers. If you have an airprint capable printer you just need to make sure they share the same network. If it is just wifi only then there are various apps that can help. I don't remember any names right now because I have been using an airprint printer for awhile now.Ok how can I print from my 4s and what apps do I need ect ect? Thanks all
I bought an HP Photosmart 5510 for $99 at Staples, and synced both my 4S and ipad3 to it. Took ten minutes and works flawlessly.