Samsung SM-A305GT/DS User Manual page 26

Basics
1
Insert the ejection pin into the hole next to the tray to loosen the tray.
Ensure that the ejection pin is perpendicular to the hole. Otherwise, the device may
be damaged.
2
Pull out the tray gently from the tray slot.
When you remove the tray from the device, the mobile data connection will be
disabled.
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