Apple has also released an iOS update for Verizon CDMA iPhone 4’s, iOS 4.2.7 is released for CDMA iPhone 4. This is a minor update to fix the bugs which was previously occurs on recent firmware.
To Update your device to new firmware, you just have to plugged your device via USB to your machine and run iTunes 10.2.1. Now you should see a prompt box, asking you to update your device to new version. Now just give a hit to the “Download and Update” button, it will automatically download the new firmware and update your device.
The last iOS update for Verizon iPhone was iOS 4.2.6, released back in February 2011.
Download iOS 4.2.7 for Verizon iPhone 4