What type of tablet?
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If the tablet has a removable back you can look there or look wherever the SD card is it might be together on the same tray or it might be behind a little door on the side of the tablet with a little pinhole that you would use a paperclip or small needle carefully to push on and pop out. However we would know more of what to tell you if you knew which tablet you're speaking about.
Hiya, magenta2458056! Just wanted to check in and see if you'd been able to get that SIM door worked out! We have steps for equipment we retail here on the Support site, so if you are still having trouble and can let us know what type of tablet you have, we're happy to look them up! Hope you're doing well.