Pre-paid $25 AT&T SIM card for FD GPS trackers. Good for 90 days. Best value. Recommended for use with tracker AT&T prepaid SIM card with $25 value. 1-2 dime off due to testing. Good for 90 days. $8/month. Voice, data, text service. All set up for Fanatic Digital GPS trackers You can add fund by calling AT&T or using prepaid card No monthly contract. Charges based on usage.