I have purchased DJI Phantome 2 non-vision have gimbal with gopro, what do I have to buy to get fpv with battery level of the drone and the height and length from control. is it also possibility to get connected to mobile phone?
The Phantom 2 controller operates on the same frequency as the wi-fi on your phone, so it's not recommended to use a phone for FPV with a P2.
For the rest, a mini OSD will provide the data you are looking for, and you need a video transmitter to send both the FPV image and the flight data from the OSD. Most people use a screen like the Black Pearl to display the FPV view and data.