Straight Talk

Straight Talk, the national MVNO who uses bits and pieces of all four major carriers networks to provide inexpensive pre-paid service across the US, now offers AT&T LTE on their bring-your-own-phone monthly plan.

You'll need a compatible phone from AT&T and a 30 day $45 "unlimited" plan, and a new SIM card from the company, but after that you should be good to go -- there's no need to unlock your phone. 

Before you rush out and sign up, it's worth noting that there are some drawbacks. As Andrew notes here, you'll not have any roaming and customer service isn't a priority, and Straight Talk's "unlimited" is a squirrelly thing. Hence the quotes. The biggest issue is how they define unlimited, which seems to vary from person to person. There is no hard cap, but the terms and conditions allow them to terminate or throttle your data at their discretion. For what it's worth, our very unscientific testing shows that in congested areas like Seattle (for instance) you'll get throttled around 2GB, where in places like West Virginia where there's less data traffic, things usually are closer to real unlimited. This will matter when you're burning through things at LTE speeds.

Anyhoo, as long as you know what you're getting yourself into, LTE on Straight Talk may be a perfect fit for you. Hit the source link if you're interested.

Source: Straight Talk. Thanks, Tony!