For the duration of your IsraeLinks trip, it is mandatory that you have a cell phone. Besides for emergencies, this will be the best way for family and friends to reach you while you are on the trip.
Sim card will be delivered to the airport. All services are unlimited including incoming and outgoing calls, international calls, text and internet.
Make sure you have an unlocked phone. Will not have Blackberry service. The best vaule for your money for one fixed price.