... is best for the prepaid card and the phone service call Through System, callback System and Mobile value code dialing. the customer ... most mobile phone on market (like Nokia, Samsung, SonyEricsson, LG, Motorola, HTC, BlackBerry, iphone, etc).6. Compatible with 2G SIM/3G USIM card ... special reference for a long time to wait for call. mobile phone SIM card IP dialer for callback and call through