Apple pushes 5G as a key selling point of its new iPhone 12. But is it useful anywhere right now? We get the view from South Korea, where 5G has been available for 18 months, and from Ghana where the previous 4G network is just rolling out. Presented by Rory Cellan-Jones, with BBC tech reporter Jane Wakefield. Produced by Jat Gill.

(Image: Illustration of the iPhone 12, Credit: Apple/ EPA).