Samsung SCS-26UC4 3G Wireless Network Extender and Amplifier Verizon Online Management: Open Access 100 Percent Compatibility with Postpaid Verizon headsets Handles up to 3 calls at once Requires HighSpeed cable internet, boosts cellular signal Creates a 3g cellular signal compatible with most postpaid Verizon phones (compatible with 4g phones but does not create a 4g signal)