现在有一款在全球43个国家地区App Store免费榜前十的APP，叫做 Number Finder -Unknown Numbers，只是提供了一个电话号码查询的功能。
这个功能代表着什么需求呢？
以下为Google直接翻译的APP介绍：
查询来自Number Finder的未知数字！
你有不明号码的电话吗？在回拨之前，找出呼叫者是谁的快速。
以下是Number Finder的惊人功能：
- 为了号码，我们会为你找到。
- 3亿数量的无限查询
号码查询器不需要任何访问您的手机目录！
免费下载号码查询器，进行无限查询。如果你想知道这个号码是如何标记的，请免费订阅。
关于订阅
以下是我们的订阅详情* offer：
认购期为1周或1个月，续订期将为每周或每月。费用从$ 0,99开始，可能会根据您喜欢的套餐而有所不同。
•确认购买时，您的iTunes帐户将收取付款。
•订阅将自动更新，除非在本期结束前至少24小时关闭自动续订。
•账户将在本期结束后24小时内进行续订，并提供更新费用。
•订阅可能由用户管理。自动更新可能会在购买后转到用户的iTunes帐户设置关闭。
•在主动订阅期间不允许取消当前订阅。
•您可以通过输入以下地址来取消订阅：https：//support.apple.com/en-us/HT202039
Inquire the unknown numbers from Number Finder!
Have you got a call from an unknown number? Before calling back, find out who the caller is quickly.
Here are some of Number Finder's amazing features:
-Ask for the number, we will find out for you.
-Unlimited inquiries from out of 300 million numbers
Number Finder out doesn't need any access to your phone directories!
Download Number Finder for free , make unlimited inquires . If you want to find out how the number is labelled by anyone, subscribe for free.
About Subscriptions
Here are details on our subscription* offer:
Subscription period is for 1 week or 1 month and Renewal subscriptions will be every week or every month. The charge is starting from $0,99 that may vary according to packages you prefer.
• Payment will be charged to your iTunes account at confirmation of purchase.
• Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
• Account will be charged for renewal within 24hours of the end of the current period, and the cost of the renewal will be provided.
• Subscriptions may be managed by the user. Auto-renewal may be turned off by going to the user’s iTunes Account Settings after purchase.
• No cancellation of the current subscription is allowed during active subscription period.
• You can cancel your subscription by entering the following address: 链接
