3. Push the tray to close itIMPORTANT: Both Micro SIM and Nano SIM cardslots support 3G WCDMA and 4G LTE networkbands. But only one SIM card can connect to 3GWCDMA / 4G LTE service at a time.CAUTION!• Do not use sharp tools or solvent on yourdevice to avoid scratches on it.• Use only a standard micro SIM card on yourASUS Phone. A nano to micro SIM adapteror a trimmed SIM card may not properly fitinto and may not be detected by your ASUSPhone.• DO NOT install an empty nano to microSIM adapter into the micro SIM card slot toavoid irreversible damage.