3G Service
If you have two SIM cards inserted, only one of them can
be enabled to receive the 3G service. You are advised
to enable SIM1 for the best performance. If you want to
change SIM, go to Settings> Wireless & networks > More...>
Mobile networks> Data roaming.
Data Roaming
Note that for roaming SIM cards, you must enable the
data roaming in the Settings> Wireless & networks > SIM
cards> Mobile data . Otherwise, the internet connection will
be disabled by default.
NOTE: If you use the 3G service of an Mobile Virtual Operator, it's
possible that you may need to activate the Data Roaming.
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