Što podrazumijevaš pod dual active? Dual standby? Većina mobitela ima 3/4G na obje kartice, ali ih ne mogu istovremeno koristiti (što ima logike).
Npr.
Redmi Note 3
The Xiaomi Redmi Note 3 supports 7 LTE bands and you can tap to an LTE network on either SIM, but once you do, the second one will be limited to GSM connectivity only.