Borislow was the founder and former chief executive officer of the company, based in Netanya, Israel, and West Palm Beach, Florida. He died July 21 of a heart attack after playing in a soccer game in West Palm Beach, according to an e-mail today from his friend, Douglas Kass, founder of Seabreeze Partners Management Inc. in Palm Beach, Florida. The company has sold more than 10 million MagicJack units, which connect to a computer’s USB port or router to enable voice calls over the Internet, according to its website. More than 25,000 retail stores sell the item. An avid thoroughbred horse owner and racer, Borislow won $6.7 million in May by predicting the winners of six races at Gulfstream Racing & Casino Park in Hallandale Beach, Florida. The winning ticket was part of $15,206 in bets Borislow made on the track’s Rainbow 6 betting promotion, according to a report in the Daily Racing Form. He received a bachelor’s degree from Widener, in Chester, Pennsylvania, in 1984, according to the school, which named him to its board of trustees. Before MagicJack, he was the founding CEO of Tel-Save Holdings Inc., a long-distance telephone-service provider then based in New Hope, Pennsylvania, which he took public in 1995. In 2011, Borislow bought the Washington Freedom, a team in the Women’s Professional Soccer league. He renamed the team MagicJack and moved it to Boca Raton, Florida. Borislow feuded publicly and in court with the league, which folded in 2012. Borislow had two children, Dan and Kylie, with his wife, Shelly, according to the National Thoroughbred Racing Association.