All you need to know about tethering with your Android device

本文详细介绍了如何使用智能手机作为热点分享互联网连接的方法,包括USB、蓝牙和Wi-Fi三种常见的热点模式,并对比了各自的优缺点。此外,还列举了美国主要运营商对于热点使用的套餐政策。


BY ANKIT BANERJEE OCTOBER 17, 2013

It’s stating the obvious to say that smartphones have had a huge impact on various aspects in our lives, and a primary cause for the “always connected” society that we’re slowly but surely inching towards. With abundant Wi-Fi and broadband internet services, and data plans from network carriers becoming cheaper, or at least, providing more data at the same price, staying online on a portable handheld device has never been easier. And if you have a 3G/4G-device, and ever find yourself needing to urgently connect to the internet on your laptop or other Wi-Fi only device, you can do so using your smartphone or tablet. That is where “tethering” comes in.

What is Tethering?

In very simple terms, tethering refers to connecting one device, such as a smartphone or a tablet, to another, such as a laptop, to be able to share the internet connection (3G/4G data connection) of the former with the latter, when a WiFi connection is unavailable. With the current crop of Android smartphones and tablets, tethering, or mobile network sharing, is possible in one of three ways.

Types of Tethering

tethering
USB Tethering
With USB tethering, you’ll need to install device drivers on your laptop and PC, and then plug in your smartphone to a USB port, and then use your computer’s connection manager to access your mobile data by setting up your smartphone or tablet as an USB modem. One of the biggest advantages to using USB tethering is that your handheld device will be charged as well when plugged in to your laptop, so there won’t be any battery drainage. But, USB tethering allows for only one-to-one connections, and of course, requires an USB cable.
Bluetooth Tethering
If you don’t have an USB cable handy, and are looking for longer use, Bluetooth tethering is the option for you. Bluetooth tethering is included as as in-built feature of Android since Android 4.0 Ice Cream Sandwich. It’s easy to setup bluetooth tethering, since all you need to do is pair your smartphone to your laptop, and then set up the connection type on your laptop bluetooth settings. While speeds maybe slower (depending on your mobile data connection and bluetooth version) than WiFi tethering, the biggest advantage to Bluetooth tethering is that the battery drain is much lower compared to WiFi tethering. Like USB tethering, only one connection is allowed via bluetooth.
WiFi Tethering
WiFi Tethering, also known as Mobile Hotspot, is the one of the more commonly used forms of tethering, mostly because connections to multiple WiFi-enabled devices is possible. The smartphone or tablet that is connected to a mobile data network can be setup as a WiFi router, allowing for a one-to-many connection type. All you need to do is turn on the Mobile Hotspot on your device, and connect your laptop the same way you would to any other WiFi network. While this option is easy to set up and convenient if you’re looking to connect multiple devices, using WiFi tethering results in a significant drain in battery life.

Carrier Restrictions (US)

Mobile network sharing is quick and easy way to get access to the internet on your laptop or PC using your 3G/4G-enabled smartphone or tablet, but can prove to be quite costly, because of the expensive data plans consumers in the US need to subscribe to, since not every plan allows for mobile network sharing.
Here’s a break down of data plans that allow tethering from various US network carriers:
Verizon Verizon logo 2013 New postpaid customers on Verizon can only subscribe to the company’s Share Everything plans which include single and multiple device plans, with a pool of “shareable data” which can also be used for tethering. The cost for line access per smartphone is $40 per month, each tablet is $10 per month, added to shareable data plans ranging from $40 per month for 500 MB, up to $375 per month for 50 GB. For example, if you subscribe to the “Single Device on Share Everything” plan and need 2GB of data, your monthly cost will total $100 ($40 for the single line, and $60 for 2GB data). Along with mobile data sharing with multiple WiFi enabled devices, the plan also includes unlimited calls and texts. You can check out Verizon’s Share Everything plans  here. If you are on an older contract, you can now use a third-party tethering app free of charge, following FCC’s ruling against Verizon blocking access to third party apps. You can also use Verizon’s Mobile Broadband Connect hotspot feature, which is priced at $20, and also includes 2GB of additional data.
AT&T, like Verizon, has new single and multiple device plans called Mobile Share. In this case, the pricing is a little different, because the line access per device varies according to the data package you subscribe to. For example, if you need 1 GB or 2 GB of data, the cost per smartphone is $45, but for 6 GB of data, the cost becomes $35 per device. Data plans range from $20 for 500 MB, to $500 for 50GB. For example, if you have a single device and require 2GB of data, your monthly cost will be $95 ($45 for line access and $50 for data). Tethering and mobile hotspot use is permitted with Mobile Share plans, provided that such use is limited to a maximum of five additional devices per hotspot device. You can find complete details about the Mobile Share plans  here. Unlike Verizon, AT&T still offers its legacy plans to new customers. Not all these plans come with free tethering, with only the 5GB data option ($50 per month) allowing tethering. You can find out more about these legacy plans  here.
Sprint Sprint allows tethering for free only with the “My-All-in Plan,” which includes unlimited 5GB of hotspot data and costs $110. With limited hotspot data, it’s important to remember that when mobile hotspot is on, all data usage (phone and hotspot devices) counts against the 5GB data allowance. If you subscribe to the Unlimited, My Way plans, mobile hotspot data charges are $10 for 1 GB, $19.99 for 2 GB, and $49.99 for 6 GB. This is in addition to either a $20 data charge for 1 GB, or $30 data charge for unlimited data.
T-Mobile does not allow mobile tethering plans on it’s single device data plans, even if you pick the unlimited data option. But, the company does feature Smartphone Mobile Hotspot (SMHS) data plans, which saw a change last month, making it more affordable. SMHS data plans start at $20 for 2.5 GB, and up to $70 for 10.5 GB of hotspot data. These hotspot packages also include a new 6.5 GB option as well, priced at $50 per month. You can find out more about T-Mobile Smartphone Mobile Hotspot data plans  here.

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<think> 我们参考了多个关于Android Tethering的引用资料,现在需要整理关于Android系统中Tethering(网络共享)的使用方法和功能介绍。 根据引用资料,Tethering主要包括USB TetheringWi-Fi Tethering(热点)等方式。 功能简介: Tethering功能允许用户将手机的移动网络共享给其他设备使用。例如,通过USB数据线将网络共享给电脑(USB Tethering),或者通过Wi-Fi将手机作为热点(Wi-Fi Tethering)供其他无线设备连接上网。 使用方法: 1. USB Tethering:通过USB数据线连接手机和电脑,然后在手机的设置中开启USB网络共享功能。 2. Wi-Fi Tethering:在设置中开启移动热点功能,设置热点名称和密码,然后其他设备通过Wi-Fi搜索并连接此热点。 设置流程(根据引用[1]和[2]): - 在设置中,用户进入网络设置,找到“热点和网络共享”(具体名称可能因系统版本而异)。 - 对于USB Tethering,当手机通过USB连接到电脑时,该选项会出现(需要USB调试打开?实际上,现在一般不需要打开USB调试,但需要开启开发者选项中的USB配置为MTP或仅充电等模式,然后会出现USB网络共享的选项)。 - 对于Wi-Fi Tethering,用户可以直接开启热点,并可设置热点名称、密码、频段等。 系统实现(引用[2]): 在Android系统中,Tethering功能由Tethering服务管理。当用户请求开启热点时,系统会调用`startTethering`方法。如果系统要求进行配置确认(例如运营商可能要求用户确认),则会显示配置界面,否则直接开启。 兼容性(引用[3]): Android 2.2开始原生支持USB TetheringWi-Fi Tethering。在Windows Vista/7和Linux上无需额外驱动,Windows XP需要安装驱动,Mac系统当时不支持(但后续版本可能支持)。 定制修改(引用[4][5]): 设备制造商或开发者可能需要隐藏某些Tethering选项(如Wi-Fi热点)。这可以通过修改系统UI或设置应用的布局文件(如`network_provider_internet.xml`)实现,或者在代码中(如`WifiTile.java`)根据系统属性控制功能开关。 因此,我们可以这样回答用户: </think> ### Android 系统 Tethering 功能详解 #### 一、功能简介 Tethering(网络共享)是 Android 提供的将移动数据网络共享给其他设备的功能,主要通过两种方式实现: 1. **USB Tethering** - 通过 USB 数据线将手机网络共享给电脑 - 支持 Windows Vista/7/Linux(免驱),Windows XP 需安装驱动[^3] 2. **Wi-Fi Tethering(热点)** - 将手机作为无线热点,供其他 Wi-Fi 设备连接 - 可自定义热点名称(SSID)、密码和频段 #### 二、设置与使用方法 1. **基础设置路径** `设置 → 网络和互联网 → 热点和网络共享` (具体路径可能因 Android 版本或 OEM 定制有所不同) 2. **USB Tethering 使用步骤** ```mermaid graph LR A[用USB线连接手机与电脑] --> B[手机开启USB调试模式] B --> C[在设置中激活“USB网络共享”] C --> D[电脑自动获取网络连接] ``` 3. **Wi-Fi 热点开启流程** 系统通过 `Tethering.java` 的核心方法触发热点启动[^2]: ```java public void startTethering(int type, ResultReceiver receiver, boolean showProvisioningUi) { if (!isTetherProvisioningRequired()) { enableTetheringInternal(type, true, receiver); // 直接开启热点 return; } // 需要用户确认时弹出配置界面 if (showProvisioningUi) { runUiTetherProvisioningAndEnable(type, receiver); } } ``` #### 三、技术实现特点 1. **系统服务架构** - 由 `Tethering` 服务(位于 `connectivity` 服务中)统一管理 - 通过 `startTethering()` 方法触发状态机切换[^2] 2. **运营商策略处理** - 自动检测是否需要用户确认(如运营商限制) - 通过 `isTetherProvisioningRequired()` 判断是否弹出配置界面 3. **UI 定制示例** 隐藏 Wi-Fi 热点的定制方案(修改系统布局文件)[^4]: ```xml <!-- 在 network_provider_internet.xml 中注释Wi-Fi模块 --> <!-- <com.android.settingslib.RestrictedPreference android:fragment="com.android.settings.network.NetworkProviderSettings" android:key="internet_settings" ... /> --> ``` #### 四、使用注意事项 1. **兼容性限制** - Mac 系统暂不支持原生 USB Tethering[^3] - 部分运营商可能禁用此功能(需 SIM 卡支持) 2. **功耗管理** - 长时间使用会显著增加电池消耗 - 建议连接电源时开启热点 3. **安全建议** - 始终设置 WPA2/WPA3 加密密码 - 避免在公共场合使用默认热点名称
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