Geo, I have a problem and maybe you guys have it too.
My US bought iPhone 5 from Verizon with a Smartone SIM had some of the most impressive GPS performance ever. It was so good, it knew exactly where I was even in a densely packed Mongkok as a pedestrian. It locked on within seconds and help me guide a friend in his car from Shatin all the way to Yuen Long accurately.
However, every consequent phone I've bought in Hong Kong - Nexus 5 and Nokia Lumia 925, had terribly inaccurate GPS'. It didn't matter if I was outside, or had the phone flat - they just refused to lock on to my position! I tested my friends phones - iPhone 5s, iPhone 6, Galaxy Note 2, all of which were bought in Hong Kong, and they all had the same problem as well.
I'm beginning to think that phones bought in Hong Kong simply come with wonky GPS units, but then again there are hundreds of thousands of smartphones in Hong Kong alone and it doesn't seem plausible that all of them are inaccurate.
If anyone does receive a consistently good GPS signal or uses their GPS frequently, would you kindly state where you bought your phone, the model and what network? I just don't understand how my iPhone was able to work so well when my current phone is garbage.
Just a silly theory of mine...your input is appreciated, Geo.