Egyptian startup Voxera aims to allow travelers to make phone calls using local rates and dodge roaming charges. “The user puts his or her SIM card into the device, connects it to Internet, leaves it at home and travels. Then, he or she needs to download the Voxera application, find any stable wifi connection and it’s done,” founder Amr El Gebaly told Wamda. “The application configures automatically and connects to the user’s SIM card. It is like you never travelled. It makes your phone still visible on your local GSM network which means you send and receive calls with your current local fees.” Practicality aside, mobile network operators will go nuclear in about 3, 2…