To manually update your phone's towers, power off the device and remove the SIM card. Updating your Verizon phone programs the device with the preferred roaming list (PRL).
This is because Verizon only send over-the-air updates to active customers from their server.Fortunately, there’s another method of updating your phone without being an active Verizon customer.As it widely known, all LTE Verizon-branded cell phones are required by law to come unlocked out of the box.Because of this, every Verizon LTE device you see on e Bay or other sites will be categorized unlocked.This means that you can use, for example, a Verizon Galaxy S7 on any GSM carrier like AT&T or T-Mobile. It sounds pretty amazing that Verizon phones come unlocked out the box.
But that has a side effect: You will no longer receive over-the-air updates for your device, leaving you stuck on your current Android version forever.Since it’s not an over-the-air update, you will need a computer to have your Verizon cell phone updated.This is an official method and doesn’t require doing any complicated hacks or rooting your device.Use the integrated update for the Preferred Roaming List to avoid the need for a Verizon Wireless service call.Push and hold the power button to turn the phone on. Press "Send."Push "2" when the Update menu begins to play.When prompted, choose the second option, after which the phone will begin to update and the call will end.