Based on the survey, we can see three factors that affect the reliability of the device is dropped to a hard surface, water drop and not repaired within 3 years very interested students. The less important three factors account for a very low, indicating the strength of a handset affect decisions to buy the phone. Which factors waterproof phones but not a high proportion of the remaining two elements because it is not common for many mid-range phone line or lower, but it is increasingly interested in the technology as well as human demand growing today.
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