Most of the iPhone devices have the AirPrint feature. Using this feature, you can share the documents on your iPhone with a wireless printer that is connected to the same wireless network and print them wirelessly. If you wish to add your wireless printer to the iPhone, refer to the how to setup wireless printer on iphone instructions given below.
Prepare Your Wireless Printer
Connect The Printer And Your iPhone on The Same Wireless Network
Performing The Print Operation From Your iPhone Device