Final answer:
The provided information does not directly confirm or deny the claim about Cambridge Reports or the given percentage of consumer ratings for service companies. It addresses consumer uncertainty in the market and concerns about data control.
Step-by-step explanation:
The statement provided does not specify statistics from Cambridge Reports regarding the percentage of consumers who rated the quality of service from companies as "excellent".
The information given suggests that certain phone service providers may not be as reliable as they once were and that consumers often have doubts about the quality and suitability of available market options, highlighting an element of uncertainty and lack of control over data collection.
There is also a mention of market existence being challenged when product quality information is not perfect. However, this does not directly confirm or deny the claim about Cambridge Reports or the exact percentages about consumer ratings for service companies.