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Yes, at a minimum you should turn cellular data off. And you can still receive a call - including those junk calls. If you answer, or if the system thinks you answered when it switches over to voice mail, or you butt dial, you will trigger a $10 TravelPass charge.
If you want 100% guarantee no charges unless you want to use phone where you don't have wifi, then you need the airplane mode process.
In either case, since you set wifi preferred when roaming, you can still use wifi calling when in range of wifi and not trigger extra charge - just make sure you see that VZW Wi-Fi