Can I use Apple Watch as my only phone

If your Apple Watch is connected to Wi-Fi or cellular With a Wi-Fi or cellular connection, your Apple Watch can do the following things, even if your iPhone isn't with you. Make and answer phone calls. Send and receive messages. Use Siri to get directions, send iMessages, and more.

Can you use an Apple Watch as a standalone phone?

Your Apple Watch can make phone calls and send texts even when you're away from your phone. To use this feature, though, you do need to be connected to a cellular or Wi-Fi network. The Apple Watch Series 7 has a 20% bigger screen than the Series 6 and is the first Apple Watch that features a QWERTY keyboard.
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Can you use Apple Watch without owning iPhone?

Apple Watch owners usually need their own iPhone to pair with the watch during the setup process. However, a feature called Family Setup offers a way around that requirement so you can set up an Apple Watch for a child or another family member who doesn't own an iPhone.