Using WiFi for mobile calls

[#1]

The guy in the EE shop just down the road told me a Samsung S6 supports WiFi calling if it's bought from them with the appropriate firmware which included the WiFi calling feature.

Well he would say that wouldn't he.

[#2]

If you ask to record the conversation because "you have memory problems"
You can be more sure but not 100 %, they are being honest with you.

Its disappointing that companies esp large ones, think its acceptable to lie to customers. It has been getting worse of the years.

[#3]

Have you tried a free call app. They are available for android but i don't know about iphones.