Comment by fpgeek

It's not just just Verizon. AT&T, in particular, has a habit of locking important features (VoLTE, Wi-Fi Calling) to phones running AT&T-branded and certified software. So unless the device you want is sold by AT&T and you get the AT&T-branded version, you're SoL. They even do IMEI blocking, so even if your device could otherwise work...