We are 2Phone Technology Co.,ltd based in , China. We are member of Tradekey.com since April, 2011. Our business is related to Electrical & Electronics Supplies industry and we specifically deal in iphone power case. Please find our product details below: Power case with Dual SIM Dual Standby for iphone 4 Power case for iPhone 4 with Dual SIM Dual Standby! With multi-functions, dual sim dual standby+battery pack+protective case. Thank you for taking the time to go through our business profile. If there are any question, inquiry or comments, please feel free to contact us.