Is it possible to make a voice call with this shield?
This HAT does not have an audio codec, as result, it lacks a voice calling feature. That is without the audio codec(audio circuit) the call will not send or receive any sound.
Can I use with other USB Cable?
We don't recommend the usage of long and low-quality micro USB cables between Base Shield and Raspberry Pi. It causes data and power loss. Thus, the cable included in the package works greatly.
Is it possible to use it with PoE Hat?
Yes, it possible.
What is the maximum current, this module needs?
The current consumption depends on the module you will be using with the Base Shield. Please check the datasheet of the respected module that will be used, for power consumption details.