ZTE ZMAX - Manual (Page 18)

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CAUTION: To avoid damage to the phone, please do not use other kinds
of SIM cards, and do not use a non-standard micro-SIM card cut from
a SIM card. You can get the standard micro-SIM card from your service
provider.
Installing the microSDHC™ Card
The microSDHC card (sold separately) can be installed and removed
while the phone is turned on. See Remove the microSDHC Card From
Your Phone.
1. Use the tray eject tool to take out the card tray.