Verizon Jetpack MiFi 6620L Review & Rating | PCMag.com. I have always carried a Verizon MiFi device; mostly because I don't trust public WiFi, and I hated having to look for Internet access when traveling. I wanted an encrypted, secure connection wherever I went, and Verizon has the broadest coverage available. However, when I recently realized that my old unit wasn't performing up to snuff, I decided to upgrade. So, I settled on the JetPack 6620L brick. It is chunky; but, it has a removable 4000 mAh battery that doubles as a device to charge a phone on the go. I bought an extra battery for $15, and, voila, I have enough juice to have Internet and phone for several days without power. The device is pricey ($200) unless you are willing to extend your contract 2 years; but, not having to worry about Internet or power for a weekend? Priceless.