First, contact your wireless service provider to find out what network your area is actually covered by (800MHz Analog, 800MHZ Digital, 1900MHz Digital, GSM). Although a phone may be capable of working on multiple networks, you want to determine what network you're actually using. If you're in a 800MHz range area (analog or cellular) you need a single band cellular antenna. If you're in a 1900MHz range area, you'll need a dual band antenna. Once you have this information, look through your options above.