$25 Alarm SIM Card for GSM Home/Business Security Alarm System - 120-Day Wireless Service 120-Day Wireless Service at 2 voice, 2 text 2/MB nationwide 2G 3G & 4G LTE Data. 1250 Minutes or 1250 Texts or 1250 MB 2G 3G 4G Data. Alarm SIM is designed for users that need a minimal amount of airtime each month/year. Receive alerts from your wireless GSM home/Business security alarm system for a Low Cost Plan of $25.00. Supports majority of 2G, 3G and 4G LTE GSM Alarm Systems. Our service will work within the United States. Check Coverage at STKMap. Roaming is not supported in our plans.