Head over to iTweak iOS to update the Verizon firmware, there is also a hack available for T-Mobile and AT&T firmware if you missed them earlier this month.
Details on the Verizon firmware hack:
“This hack enables 1x Advanced and EVDO Rev. B on the iPhone 5 and iPad 3, 4, and mini as well as enhancing LTE data speeds. Though Verizon is limited to EVDO Rev. A, the device itself becomes more open to an increased amount of bandwidth thus allowing for better throughput of data and data connection. Throttling code was put in place to limit users to a certain amount of bandwidth on 3G and LTE but will now have a better opportunity for some faster speeds. This won’t increase signal so don’t expect it to like the AT&T version of this hack.”