to have the data work correctly on any sim, all the below must be done
1-select the sim you want to use for data in sim card manager/data service network
2-have the same sim configured as gsm/wcdma (auto connect) on connections/more networks/mobile networks/network mode
when you select option one, the phone tries to perform task 2 too, but fails, thus the data sim is left in "GSM only mode" and will only have edge data, never connecting to HSPA/ 3G.
here is what i have to do each time to switch data from Sim-1 to Sim-2 (screenshots attached)Screenshots.zip
Screenshot 1- you will notice data is set for sim 1 and HSPA is active
Screenshot 2- select sim 2 for data
Screenshot 3- the phone will disconnect data on sim 1 to switch
Screenshot 4-phone will try to set sim 2 as "gsm/wcdma (auto connect)"
Screenshot 5- but gives alert message and fails
Screenshot 6- sim 1 is still on "gsm/wcdma (auto connect)" and the data connection for sim 2 is only edge
Screenshot 7- Sim 2 is still on "gsm only" and does not connect on hspa no matter how long you wait
Screenshot 8- for data on sim 2 to work properly, first change sim 1 to gsm only
Screenshot 9- then change sim 2 to "gsm/wcdma (auto connect)" and wait for 5 seconds, the phone will connect on HSPA .. success
now my big question is, does this happen to everyone with s4 mini 9192, or is it just me??
by the way, this occurs on both my Egypt stock firmware and the j2 india firmware i just flashed.