OS X El Capitan: The Missing Manual

Tethering (Personal Hotspot)

If you have an iPhone, Android phone, or another smartphone, you don’t even need a cellular modem; you’ve already got one. Most smartphones nowadays offer tethering, where the cellphone tunes into the Internet for the benefit of your laptop (or even your desktop computer). The phone connects to your laptop either with a USB cable or wirelessly (Bluetooth or Wi-Fi).

The nice part is that you can get online almost anywhere there’s cellphone coverage. The less-nice part is that the connection isn’t always blazing fast, and you have to pay your cellphone company for the privilege. (It’s usually $20 or $30 on top of your regular monthly phone plan; for that, you’re allowed to send and receive 2 gigabytes of data each month. If you go over the limit, you pay overage fees. Good luck figuring that out.)

Here’s a typical example: Suppose you have an iPhone. You open Settings→General→Network→Personal Hotspot. You turn it on. You assign a password to your private little hotspot. The iPhone asks how you’ll be connecting to the phone; let’s say you tap Wi-Fi.

Now, on your laptop, you choose your iPhone’s name from the menulet. (If the phone has iOS 8.1 or later, the menulet shows the iPhone’s name even if it’s asleep and Instant Hotspot is turned off, as described on Instant Hotspot.)

You enter your hotspot password (just this time—later, your laptop will remember), and ...