LG Phoenix 2 / Escape 3
HD Calling
The real news here is the availability of VoLTE to Cricket customers
This is important in areas where AT&T only broadcasts LTE on its low band holdings (like in most of NC for example).
The one issue I can see though is AT&T's normal insistence on only allowing VoLTE on certain devices (they are much more strict when it comes to VoLTE provisioning as compared to Verizon and T-Mobile).