You first set up your iPhone, and then set up your iPad.
On your iPhone, go to Settings 
> Cellular.
If your iPhone has Dual SIMs, choose a line (below SIMs).
Do any of the following:
Tap Calls on Other Devices, turn on Allow Calls on Other Devices, then choose your iPad along with any other devices on which you’d like to make and receive calls.
This allows iPad and other devices where you’re signed in with the same AppleID to make and receive calls when they’re near your iPhone and connected to Wi-Fi.
Tap Wi-Fi Calling, turn on Wi-Fi Calling on This iPhone, then turn on Add Wi-Fi Calling For Other Devices.
This allows iPad and other devices where you’re signed in with the same AppleID to make and receive calls even when your iPhone isn’t nearby.
On your iPad, go to Settings> FaceTime, then turn on FaceTime and Calls from iPhone. If you’re asked, turn on Wi-Fi Calling.
Make a call: Tap a phone number in Contacts, Calendar, FaceTime, Messages, Search, or Safari. Or open FaceTime, enter a contact or phone number, then tap .
Receive a call: Swipe or tap the notification to answer or ignore the call.
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.
FAQs
You can make and receive calls on your iPad by using Wi-Fi Calling to relay phone calls through your iPhone (iOS 9 or later required). Cellular charges might apply. Wi-Fi Calling isn't available from all carriers.
Does my iPad have its own phone number? ›
You can find your phone number on your iPad in two different ways. If you have an iPad that has Wi-Fi + Cellular, it has a phone number associated with the SIM card – you cannot place a voice call to this number, since it is a data-only plan, but you can find it in the Settings app's About section.
Can I use an iPad without an iPhone? ›
You can use an iPad without owning an iPhone. iPads are standalone devices that operate independently of iPhones. You can use an iPad with a Wi-Fi connection and set it up with your Apple ID, just like you would with any other Apple device.
Can I use my tablet as a phone? ›
Tablet calling is easy
Once you've established an internet connection, you really need only two things to make your tablet function as a smartphone: an app that makes use of VoIP (Voice over Internet Protocol) or VoLTE (Voice over LTE) wireless calling technology, and a pair of headphones.
How do I add a phone number to my iPad? ›
On your iPhone or iPad, go to Settings > [your name] > Sign-In & Security. Next to Email & Phone Numbers, tap Edit. next to your phone number and follow the instructions.
Can you FaceTime on an iPad without cellular? ›
You can use FaceTime over Wi-Fi1 or over cellular on supported iOS or iPadOS devices.
What happens if I plug my iPhone into my iPad? ›
You can connect your iPhone to your iPad, Mac, and other computers to transfer data, like your photos and videos, using a USB-C cable compliant with the USB-C standard, such as the cable that comes with your iPhone. These cables are widely available from Apple and other manufacturers.
How do I connect my iPad to my phone carrier? ›
Go to Settings > Cellular Data > Find a New Plan. Select a carrier from the list of local carriers. Follow the onscreen instructions to set up and activate your new cellular data plan on your iPad.
Can I add a phone line to my iPad? ›
Set up eSIM
Go to Settings > Cellular Data. Do one of the following: Set up the first cellular plan on your iPad: Select a carrier, then follow the onscreen instructions. Add another cellular plan: Tap Add a New Plan.
How can I tell if my iPad has cellular? ›
You can tell if your iPad is cellular by looking at the top of it. Does it have a black or white strip? If it does, it has cellular capabilities. It will also have a SIM slot, like a mobile phone, that you can put a nano-SIM card into.
You can use the phone number of your iPhone with Messages and FaceTime on your Mac, iPad, or iPod touch.
Can I use my iPad as a telephone? ›
To take calls on your iPad, go to Settings > FaceTime on your tablet. Turn on the switch next to Calls From iPhone to start receiving phone calls on this device. For calls to your Mac, open the FaceTime app on your computer.
Is an iPad a mobile device? ›
Like all tablets, iPads are light and mobile compared with laptop computers. The latest iPad models range from 1.05 pounds for the 10th-generation iPad Air to 1.28 pounds for the iPad Pro 13-inch (M4).
Can I use an iPad without cellular service? ›
If iPad is connected to the internet using the cellular data network, an icon identifying the cellular network appears in the status bar. If Cellular Data is off, all data services—including email, web browsing, and push notifications—use Wi-Fi only. If Cellular Data is on, carrier charges may be incurred.
Can you text from an iPad phone number? ›
You can send a text message to one or more people to start a new conversation. Open the Messages app on your iPad. at the top of the screen. Enter the phone number, contact name, or Apple ID of each recipient.
Can I switch call from iPad to iPhone? ›
While on a FaceTime call on your iPad, you can hand off the call to your iPhone or Mac. To hand off a FaceTime call, your devices need macOS 13, iOS 16, or iPadOS 16 or later. You must be signed in with the same Apple ID on both devices.
Is Google Voice free? ›
Cost and availability
When you call from the US, almost all Google Voice calls to the US and Canada are free. Some calls to specific phone numbers in the US and Canada cost 1 cent per minute (USD). Calls outside the US are at listed rates.
> Cellular.
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