Storage and SIM
The iPad was released with three options for internal storage size: a 16, 32, or 64 GB flash drive. All data are stored on the flash drive and there is no option to expand storage. Apple sells a camera connection kit with an SD card reader, but it can only be used to transfer photos and videos.
The Wi-Fi + 3G model has a micro-SIM slot (not mini-SIM) located on the side of the device. The 3G model may be used with an AT&T data plan that does not require a contract. Apple has heavily advertised the uses of the no-contract plan on their website. Unlike the iPhone, which is usually sold locked to specific carriers, the 3G iPad is sold unlocked and can be used with any compatible GSM carrier. However it does not support T-Mobile's 3G Network and Verizon does not use world-standard GSM SIM cards.
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