Question

what does the idiom in this text suggest? cell phones once cost an arm and a leg, but today the majority of people can afford them. cell phones once varied greatly in price. cell phones were once very expensive. cell phones were once popular items to trade.

Explanation:

The idiom "cost an arm and a leg" means something is very expensive. In the context, it refers to cell - phones being costly in the past.

Answer:

Cell phones were once very expensive.