Thank you for reaching out to the Samsung community! We would like to inform you that it is the default feature of the device and only one SIM will be connected to the 4G/LTE network at a time.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
