GTX Jaculus Unisoc T618 tablet

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Senior Member
Feb 6, 2008
Hi All,
As usual, I put myself in trouble by purchasing something nobody knows and looking for help. I got a tablet containing Unisoc T618 chip but it seems like it is rebranded I can't find who the manufacturer is and if it is possible to flash a new ROM that can enable phone functions. The link to some details of the tablet is here GTX Jaculus. It is in Turkish but specs are obvious. Is there anybody that can help me identify who the manufactırer is and if it is possible to enable VoLTE on this device? I want to receive calls and be able to use my SIM card to call others. Currently, only the data plan works.

Thanks in advance