Just curious, I have iPhone 5 with latest iOS 8.3
I also have latest Nexus 7 with 5.1.1 and Blackberry Q10 with 10.3.1 OS (all OS are all latest version).
I am in a room where a wifi signal is pretty weak, however my N7 and Q10 can pick up the wifi signal (indicator is half strength) while my iPhone 5 does not pick up the wifi when in the same room and the same spot.
I also have latest Nexus 7 with 5.1.1 and Blackberry Q10 with 10.3.1 OS (all OS are all latest version).
I am in a room where a wifi signal is pretty weak, however my N7 and Q10 can pick up the wifi signal (indicator is half strength) while my iPhone 5 does not pick up the wifi when in the same room and the same spot.