VISIONTEK 21G GSM Desk Phone allows users access to voice calls communication on GSM mobile phone network with a SIM Card. Our FWP combines simplicity with advanced features. VISIONTEK 21G GSM Desk Phone enables instant telephone access to various applications like providing a landline alternative for remote areas, ships, vehicles, construction, oil and mining companies, exhibitions, disaster recovery service or any temporary sites. VISIONTEK 21G is available in two colors White & Black and also with PCO billing features.