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Is there looks a phone manufacturer?
Umi Emax mini does not support 3G / 4G SIM card in both slots. In my case, only SIM 1 has full support for 2G, 3G and 4G. SIM2 slot only supports 2G network. Data transmission is very slow about 18 kB / s max. The "Data usage / Cellular data" allows you to switch data transfer, but does not switch the modem 3G / 4G. Or is connected rigidly to the slot SIM1 or error in the program Android 5.0.2. There is no support for 3G / 4G SIM card for both slots
Two cards work in a 3G network, but only in SIM1 slot. The slot SIM2 none of the cards do not work in 3G network |
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