ZTE BLADE A310 Guide De Démarrage Rapide page 6

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Installing the nano-SIM Card(s) and
the microSDHC™ Card
WARNING!
To avoid damage to the phone, do not use any other
kind of SIM cards, or any non-standard nano-SIM
card cut from a SIM card. You can get a standard
nano-SIM card from your service provider.
nano-SIM
card slot 1
nano-SIM
card slot 2
NOTE:
The two nano-SIM slots support 4G/3G/2G networks.
When one nano-SIM card is set to connect with
4G/3G networks, the other installed nano-SIM card
can only connect with 2G networks.
microSDHC
card slot
6