Airprint is not available in older models, Xerox (like every other manufacturer) does not add new standards to old devices.
If you absolutely must print from a mobile device using a technology that did not exist when your printer was made, you would need to go third party and install something like this or buy another printer.
I using WC 3045NI but still dont understand why we cant use airprint (Apple) support also old models has this support. Xerox still dosent give any support for this? How long time we have to wait or have we trash out WC3045 NI ?