Lumia 640 Changelog :
Voice over LTE support enabled for selected operators.
Native Wi-Fi calling support enabled for EE UK and T-Mobile USA.
Additional improvements to stability, audio quality, Wi-Fi and cellular connectivity, national roaming, and more.
Lumia 640 XL changelog:
Voice over LTE support enabled for selected operators.
Native Wi-Fi calling support enabled for EE UK.
Additional improvements to stability, audio quality, Wi-Fi and cellular connectivity, national roaming, and more.