As Windows Server has so many versions I'm going to not document any known method but as you are the IT suggest you research a bit more as well as ask Apple how to setup the usual iOS devices.
Allowing devices on the internet without being logged onto the domain sounds like a classic setup and would not be a Windows Server policy but just an access point and password.
I Could use some help on a issue in any one has some suggestions.
I just recently took over the IT for a small business. They want to be able to get wireless access to their smartphone and tablets in the office. However after configuring the wireless AP. Active directory is stopping external traffic to the internet for these devices and I can't seem to find the policy and disable it. PC that are on the domain have no issues. Does any one have a work around to allow the tablets and smartphones on the AP with out being on the domain.