So how many satellites are being used for the solution and with what kind of SNR then?
I have tested many different phones during the last few months and while it’s possible to get an unassisted fix by placing the phone near a window for 10 minutes or so, there’s basically no chance to get a fix in the middle of a regular house I’m living in. Some buildings may make it harder than others, but it’s not even supposed to be reliable without external antenna, especially when you have to download almanac from the sky.