One call from me to 150, very helpful guy sorted me out with the signal boost after doing an upload test.
best to be on unlimited plan.
we now have 3 BT mobiles with full bars throughout the house, and sitting in garden. Very happy.
Had an unexpected call this morning from BT customer services, after a brief pleasant chat informed an assist signal booster will be with us between 3-5 days
The signal box works with all mobiles with a BT & EE sim, Wi-Fi calling works with selected phones. The "Coming Soon" bit will be based on the fact is current with the trial team for final testing!
I don't think BT SmartTalk is the same as WiFi calling. It just routes mobile calls as if through the landline at landline rates. So depending on your landline plan you'd pay over the odds for calls to say other mobiles. I have unlimited mobile to mobile calls so this would not work efficiently for me.