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4 Mobile Connectivity

Learn how mobile devices connect through Wi-Fi, Bluetooth, cellular service, and other wireless options, and how to configure and troubleshoot those connections.

Choosing a connection

Mobile devices use different wireless technologies for local networks, nearby accessories, carrier internet service, and direct device-to-device tasks. The exact menu names vary by device and operating-system version, but the configuration principles are similar.

Connecting to

To connect to a wireless network, turn on , select its network name (SSID), and enter the password if prompted. A device typically saves a network after joining successfully and may reconnect automatically. For a hidden network, enter its name and security details manually. Use Forget or Remove to delete saved credentials, such as when the network password changes.

A connection does not guarantee internet access: the router or service provider may be offline. On networks with data limits, use a metered or low-data setting if one is available. Be cautious about sending sensitive information over public networks; a trusted cellular connection or reputable may be preferable.

Pairing accessories

connects nearby accessories, including headphones, keyboards, speakers, and vehicle systems. Pairing establishes trust between two devices. After pairing, they may reconnect automatically when is on and the devices are nearby.

If an accessory does not appear, check that it is powered on, close enough, and not connected to another device. Remove an old pairing using Forget or Unpair before trying again.

Using

provides internet access through a mobile carrier. It requires cellular-capable hardware and active service, typically through a SIM or eSIM plan. In Settings, check that mobile or is enabled. On a dual-SIM device, verify that the intended line is selected for data.

Coverage, plan limits, and roaming settings affect availability and cost. Before enabling data roaming, confirm the carrier’s charges.

Sharing an internet connection

A shares a device’s internet connection with other devices, commonly over . is the broader term for sharing a connection over , , or a cable. For example, a laptop can connect to a phone’s hotspot by selecting its network name and entering the hotspot password.

A phone’s hotspot generally shares its , so connected devices can use the plan’s data allowance. Carrier support or fees may apply. Use a strong password and turn the hotspot off when it is no longer needed.

NFC and other connection options

is a very short-range wireless technology used for contactless payments and reading compatible tags. Its availability and uses depend on the device and service. On a supported device, the NFC setting is usually in connection preferences or can be found by searching Settings for “NFC.” For payments, the payment service and card must also be set up; the device may require a screen lock or authentication.

Other connection options serve different purposes:

  • quickly disables wireless radios. Depending on the device and its settings, or may be turned back on separately. Follow airline instructions about permitted radio use.

  • (virtual private network) routes some or all network traffic through a configured service. Connect only to a you are authorized to use; it does not make every online activity safe.

  • can carry calls over when supported by the device and carrier; setup and availability vary.

  • shares a phone’s connection through a cable on supported devices and can help when is unavailable.

  • Direct, casting, and nearby sharing support direct device-to-device tasks such as displaying media or transferring files. Supported features vary by platform.

Troubleshooting connections

Troubleshoot a connection in this order:

  1. Confirm that the relevant radio is enabled and is off.

  2. Check signal strength, coverage, distance, and whether the other device or access point is powered on.

  3. Recheck the network password or pairing prompt. If needed, forget the saved connection and set it up again.

  4. For , verify service activation, the selected SIM or eSIM line, and the data setting.

  5. Restart the devices, then check for software updates. If a hotspot or cellular connection still fails, check the carrier plan and device support.