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Yes, there are plenty of tablets without a SIM card, generally those that are WiFi only though. I’m not trying to be a jerk, but I would be remiss if I didn’t mention that possibility, especially since I own a WiFi only tablet personally. Assuming that it is not WiFi only, I would look under the battery if the rear cover is removable. Some tablets, the Nexus 7 for example, also have very small SIM card trays that are on the edge of the device and require a small tool to unlock the catch. These can blend in and be quite difficult to see unless you look carefully.