What can we infer about the previous ownership of phones in the shop?

The inference that the phones in the shop were sold quickly suggests that there is a high demand for them or that they are popular items amongst customers. The term "sold quickly" implies a continuous turnover, indicating that the phones do not remain in stock for long periods. This can often be a result of effective marketing, pricing strategies, or the desirability of the product itself.

Considering the other options, 'never sold' implies a complete lack of demand, which contradicts the notion of selling quickly. 'Given away' suggests that phones were distributed without any financial transaction, which does not align with the idea of sales. Lastly, 'stored overnight' might imply a temporary holding period, but it does not inherently provide any insight into the speed of sales. This context helps clarify why the correct answer reflects a positive sales trend, emphasizing the phones' quick turnover in the shop.