Like in any mobile phone or tablet device, besides inserting SIM card - you can use memory card for additional storage space. Samsung Galaxy tab device supports microSD or microSDHC memory cards with maximum capacities of 32GB. You can easily insert and use memory card to store more media
Insert SIM card in Samsung Galaxy Tab
You can make and receive calls on Samsung Galaxy Tab tablet. You need to subscribe to mobile / cellular service and get SIM (Subscriber Identity Module) card for the same. SIM card holds your subscription details, such as your personal identification number (PIN) and optional services.