SIM Application Toolkit. SIM Application Toolkit (commonly referred to as STK) is a standard of the GSM system which enables the Subscriber Identity Module (SIM) to initiate actions which can be used for various value-added services.
Cook them immediately if they have been thawed for no more than three days! Once you cook them they will last at least for another four or five days in the fridge! If nothing else put them in a good shrimp marinade for about one half hour - then SMOKE them over mesquite or hickory wood for one hour. These will be eaten up before five days is over! Good Luck & Bon Aperitif!
Let it thaw overnight in the fridge, or for faster thawing, take the shrimp out of its package, put it in a bowl of cold water, and let a trickle of cold water run into the bowl while excess water goes down the drain. The shrimp should be ready to cook in about 15 minutes.