$50 Prepaid Alarm SIM Card for GSM Home/Business Security Alarm System - No Contract- 180-Day Wireless Service 180-Day Wireless Service at 2 per minute,text, 2G 3G & 4G LTE Data. That's 2500 minutes or 2500 texts or 2500 MB 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 $50.00 for 180 days. NO Activation fee. NO Contract. NO Credit Check. Supports majority of 2G, 3G and 4G LTE GSM Alarm Systems. Our service will work within the United States in partnership with T-Mobile Network. Roaming is not supported in our plans.