Incredibly useful feature that many do not know exists: Make and receive Wi-Fi calls from another device
Make and receive Wi-Fi calls from another device
If your carrier supports Wi-Fi Calling on iCloud-connected devices, you can also make and receive Wi-Fi calls on other devices.
Wi-Fi Calling isn’t available on Mac Pro (Mid 2012).
Make sure that you’re signed in to iCloud and FaceTime with the same Apple ID that you use on your iPhone. Also make sure that your devices have the latest software.
To place a Wi-Fi call from your iPad, iPod touch, Apple Watch, or Mac, follow these steps.
Call from your iPad, iPod touch, or Mac
If you haven’t added your device yet—which allows it to use Wi-Fi Calling—add it.
Enter a contact or phone number and tap Wi-Fi call .
You can also place a call by tapping a phone number in Contacts, Mail, Messages, Safari, and other apps.
Call from your Apple Watch
Open the Phone app.
Choose a contact.
Tap Wi-Fi call.
Select the phone number or FaceTime address that you want to call.
Say you have an iPhone using the most recent version of iOS with service from a carrier on this list ([https://support.apple.com/en-us/HT204039](https://support.apple.com/en-us/HT204039) — must say “Wi-Fi Calling on supported iCloud-connected devices”
And you also have a Mac using Mojave and/or an iPad that does not have cellular ability.
By turning on “wifi calls on other devices” you can use your Mac and iPad (as long as they are connected to the internet in some way) to send and receive phone calls even when you don’t have your iPhone with you, as long as your iPhone is on and connected to your carrier’s LTE network. There appears to be a hard limit of 5 devices you can use this service with, but one or more of them could even be another iPhone that doesn’t have a data plan! In fact, I am even able to be having a conversation on the “host” iPhone and still make new calls at the same time on the other iCloud calling enabled devices!
Speaking hypothetically now, there appears to be very little in the way of technical barriers to actually using your carrier account over wi-fi without needing to have actual cellular service through a SIM card on any internet connected device.
I have been using this service for probably over two years now, first with Tmobile and now more currently with ATT. I was experiencing a glitch with my carrier (AT&T) or Apple, not sure which was the culprit (probably ATT). I would get a pop-up error that too many devices had wi-fi calling enabled (even though it worked to send and receive calls just fine). I first had to educate my incredibly helpful and open minded AppleCare advisor about it on our call, then we had to try to convince an advisor at ATT that it actually existed to try to troubleshoot the problem. After 2-3 hours of this, a second ATT rep finally realized that “calls on other devices” is a real thing (more research suggests the internal ATT name for this miracle is NumberSync), but he had no idea about what the device limit might be or why I was getting the error.
I eventually thought to try asked him to disabled wi-fi calling for my account from his (carrier) side and then re-enable it, I had to sign out of iCloud on the “host” iPhone then power cycle it, sign out of FaceTime on my other devices and power cycle them too, then turn it all back on, first in iPhone settings then FaceTime on the Mac. So far so good, its working again to send and receive phone calls but we’ll see if I still get the “too many devices enabled” error going forward.
Long story short, this calls on other devices feature is immensely useful, check it out!