I have a Galaxy S3 already and have been following this forum for a while, but I have never had problems with it as with this one. It's about my Galaxy S4 mini DUOS (i9192). I've bough the phone from an unofficial seller because i9192 was never supposed to be imported in Croatia (EU). The phone came with I9192XXUAMF7 build and modem. Today I've expereinced that the phone was running fine but I couldn't make any calls and nobody could call me untill I've taken out the battery and SIM. It was runnign on one SIM only. Network was OK and signal was full. I' would like to change the modem to see if that's the problem.
My question is - has anyone experienced anything similar or has changed the XXUAMF7 modem? I'm located in Croatia (Europe) and the closest country modem localisation is Ukraine. Should I change it to Ukraine modem?