iPhone Wi-Fi Capabilities
Understanding the Wi-Fi Specifications of Apple Devices
iPhone 6 and 5GHz Antenna
* The iPhone 6 does not have a 5GHz antenna for Wi-Fi.Troubleshooting 5GHz Network Visibility
* Ensure that your SSID (network name) does not contain hyphens.Wi-Fi Calling Availability
* LTE Advanced, LTE VoLTE, and Wi-Fi calling are available in certain areas and with specific carriers.2.4GHz and 5GHz Band Switching
* iPhones allow you to switch between 2.4GHz and 5GHz bands in the "Personal Hotspot" settings. 
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