I am currently having problems with 3 Apple wifi-capable devices in the same location - in a garage outside a main building.
All three devices can connect to the wifi network with no issues within the main building.
Once moved to a garage, the Mid 2014 MacBook Pro and new iPad 2 are still able to connect to the wifi hotspot and they both indicate strong signal strength: MacBook Pro shows full 5 bars and the iPad shows 2 (out of 3) bars.
The iPhone 6 simply cannot connect to the same Wi-Fi hotspot at all. I have tried turning on and off wifi and airplane mode. They do not have any effect.
Does this indicate a hardware problem? What can I do to make iPhone connect to the Wi-Fi?