No. You can use only one 4g sim card in this phone.
Tecno i3 comes with 3050 mAh non-removable battery, which can last a day's usage easily.
Yes, Tecno i3 is a true 4g VoLTE mobile phone.
Yes, you can use Jio sim card with Tecno i3 mobile phone. Tecno i3 is a true 4g mobile phone.