波多黎各人最喜欢聊天通话，这可能是因为打到家庭和朋友所在的美国本土的便宜套餐包含了无限制通话服务。

Puerto Ricans are the chattiest, probably because cheap plans include unlimited calls to the American mainland where family and friends are often based.

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除使用“免提”装置在通话时将移动电话与头部和身体保持一定距离以外，限制通话次数和时间，也会减少接触量。

In addition to using "hands-free" devices, which keep mobile phones away from the head and body during phone calls, exposure is also reduced by limiting the number and length of calls.

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苹果限制用到网络、GPS及其他与通话相关的资源的后台服务的使用a，以便节省电池寿命。

Apple restricts the use of background services that use the network, GPS, and other phone-related resources, in order to conserve battery life.

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