It seems that MSM8952 can support SIM2 card stay on UTMS.Like Xiaomi Redmi note3.
But F5122's SIM2 card could only stay on GSM while SIM1 card staying on LTE.
Nowadays the GSM network is gradually being phased out.Then the SIM2 card will have no signal.
Besides,the mobile phone performance seems to be limited.The two A72 cores often offline.While playing games is not smooth.
Hope Sony can solve these problems.