有些人认为移动电话很有用和方便。
Some people think that mobile phones are useful and convenient.
客户告诉我们，我们的服务降低了在家里和漫游在外时的国际长途电话费用，这对他们很有用。
Our customers tell us that they value our current services to make low cost international calls when at home and when roaming.
无约电话的技巧在商业生活中的很多方面都很有用。
Cold calling skills are very useful in many parts of business life.
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