I've now been in possession of four different IMEI's, one more on it's way back from warranty repair. I've had them on basic 8.0 tot Preview to the alleged latest and greatest official TMO 8.1 upgrade. I've also owned five phones with WFC since 2006.
Unless I am just the runt of the luck litter, I think it reasonable to pronounce the 925 as a complete, total, waste time and technology when it comes to WFC.
Which is why I bought the first one. Also huge connectivity issues on all of them. Not up to Nokia standards. Avoid this phone.