BLU Studio 7 II is an unlocked GSM smartphone with a 7-inch, 600 x 1024 resolution LCD display, and runs Android 5.0 Lollipop. The phablet was released in August 2015 .
If you are using an att or tmobile sim on a gsm unlocked phone there should be no hiccups in setup as long as the account is paid. If you are using an MVNO SIM it is important to setup a new APN in your network settings. Here's an example of seting up an MVNO network: