Updating your Verizon phone programs the device with the preferred roaming list PRL. If your carrier releases a mandatory update, you'll see an OK button instead of an Update button to let you know that the update was downloaded and installed. When a carrier setting update is available, you'll be prompted to install it. Contact the vendor for additional information. However, you can manually force an update if you feel the automatic process has failed. Examples of Verizon 4G Devices include, but are not limited to: For more information on carrier settings updates, contact your carrier.