https://www.theverge.com/2018/10/19/18001736/verizon-google-pixel-3-unlocked-carriers-activation

Verizon will allow all of its Pixel 3 and Pixel 3 XL phones to immediately be used on different carriers, a spokesperson has confirmed to The Verge by email. When the phone went on sale yesterday, buyers noticed that the Pixel 3 was locked to Verizon’s network until it was activated. Once activated with a Verizon SIM, the device would be unlocked overnight for use with other carriers.

But now Verizon is lifting the lock fully and immediately — but maybe only temporarily. “At launch, there was an update related to an automatic overnight unlock on Pixel 3s, which also showed up on phones sold in Best Buy stores,” the spokesperson said. “We have temporarily removed it from Pixel 3 and are assessing where it will be implemented in the future.”