Bring your own phone or tablet! The AT&T Prepaid SIM Kit has everything you need to activate your own device on the AT&T network. Includes a 3-in-1 SIM card for standard micro and nano SIM devices. Keep your number and the sim works with most phones and tablets. With AT&T Prepaid service for your phone you get: no annual contract no credit check easy activation and great plan and phone choices to fit your needs—all on the nation’s most reliable network.