The caller ID issue is because permissions are not granted to contacts. So, you'll need to reverse that in the phone's settings menu. That can be fixed.
The BT issue is long-standing. It was not rectified after the B09 update either. This cannot be fixed.
The fixes come from ZTE, which spent months trying to deploy the B07 update (started on B02) and months still before the beta release of the B09, which went live about a month or so ago. I had to shelve my ZMP and it sits in its box awaiting either a fix (for backup now) or for someone to buy it.
Connectivity and picture message issues are the 2 biggest complaints on the ZTE forums. I'd encourage you to check out ZTE's forum, because while there is a lot of help here for general issues, not many T-Mo customers bought this phone. It was mainly a MetroPCS device.
Other than you and I, I have seen very very few others post here with any questions, and I'd expect that, if many people had this device, given all the multiple issues this phone has, there'd be a lot more chatter here.