Verizon has released a system update for the Pantech UML290 LTE USB Modem. This new update expected will fix the several problem such as 4G / 3G connection quality, auto-connect issues, reporting power and stability enhancements.
So, for Pantech UML290 3g/4g modem users, hopefully a new update makes the better connection. Be sure to pay attention to software update instructions before updating.
Software update instructions for Pantech UML290 download
Support : VZW , Pantech UML290 Specification