With today’s modern technology, there are several options. We first recommend that you check with your current cell phone provider (AT&T, Verizon, etc.) as they may offer an inexpensive international rate that will allow you to use your phone for voice and data needs in Israel.
Since Wi-Fi is readily available in Israel, many travelers use smartphone apps (i.e. Skype or WhatsApp or FaceTime) to make international calls over Wi-Fi.