Continuity lets you make calls on your iPod touch by relaying calls through your iPhone, which must be turned on and connected to a cellular network. To make calls this way, you need iOS 8 or later and OS X 10.10 or later. You must be signed in to iCloud and FaceTime on all your devices using the same Apple ID as on iPhone, and all devices must be connected to the same Wi-Fi network.
Wi-Fi Calling lets you make and receive phone calls on your iPod touch (iOS 9 or later), as long as you’re signed in to iCloud and FaceTime on your iPhone and iPod touch with the same Apple ID. Your iPhone doesn’t need to be on the same network as your iPod touch or even turned on.
Note: Wi-Fi Calling on other devices is available with some carriers, and cellular charges may apply.
You must first set up your iPhone (iPhone 5c, iPhone 5s, and later), then your other devices. If you log out of iCloud or FaceTime on iPhone, Wi-Fi Calling is disabled.
Turn on Wi-Fi Calling on your iPhone. Go to Settings > Phone > Wi-Fi Calling, then turn on Wi-Fi Calling on This iPhone.
If you see Add Wi-Fi Calling For Other Devices, turn it on to allow calls from other devices that aren’t on the same Wi-Fi network as your iPhone. Otherwise, you can still use your other devices to make phone calls, but your iPhone must be turned on and on the same network as those devices.
Turn on Wi-Fi Calling on your iPod touch. Go to Settings > FaceTime, then turn on FaceTime. If asked, turn on Wi-Fi Calling.
Note: If you enable Wi-Fi Calling, emergency calls may be made over Wi-Fi, and your device’s location information may be used for emergency calls to aid response efforts, regardless of whether you enable Location Services. Some carriers may use the address you registered with the carrier when signing up for Wi-Fi Calling as your location.
Receive a call on your iPod touch. Swipe the notification to answer, ignore, or respond with a quick message.
Make a phone call on your iPod touch. Tap a phone number in Contacts, Calendar, FaceTime, Messages, Spotlight, or Safari.
For more information about Wi-Fi calls, see the Apple Support article Make a call with Wi-Fi Calling.