Is it safe to use non-standard or cut SIM cards in the Cymbal 2?
No — the manual includes a warning that using any non-standard nano-SIM card, including a nano-SIM card cut from a larger SIM card, can damage the phone. You should only use a standard nano-SIM card obtained from your service provider. (Page 15)
From the official Zte Cymbal 2 manual, page 15
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