If MAC address filtering is enabled, you will have to add the Network MAC address from each device before it can connect to your wireless network.
To find the MAC address Settings -> General -> About -> Wi-Fi Address
What level of Wireless security are you using on the router?
Your router offers these security types:
- Wi-Fi Protected Access (WPA,WPA2)
- Wi-Fi Protected Setup (WPS)
- MAC Address Filtering
WPA2 WPA Personal (might also have WPA 2 enterprise, might not work) should work for all recent Apple products.
Some older I Phones will need WEP security to connect.
Make sure you have all wireless network types available.
Some routers allow you to choose only N or AC wireless connections. It may show as something like allow Mixed mode (A, B, G, or N)
The Apple Devices may only have B or G wireless network capability if they are older than 4 or 5 years.
Is your wireless network on the 2.4 or 5 Ghz band.
Some older Apple (and PC / Andriod) may only have 2,4 Ghz network capabiolty, if your wireless is 5 Ghz they will not see the network SSID.