Upvote:2
The first answer here is correct, there are cellular antennas spread everywhere in Israel, official map is available in this link.
The map is in Hebrew, but you can just zoom in on any part to see the cellular coverage.
Sample screenshot from Tel Aviv area:
Upvote:7
Israel is a small country that looooves its mobiles. Excluding some bits of the Negev desert, the entire country is blanketed with mobile phone networks, and you're not going to have any trouble anywhere populated.
Here's an unofficial coverage map for Pelephone, one of the big local operators. Note that this is crowdsourced from users, and the actual coverage is considerably better. Also, the Palestinian bits have their own operators, which is why the West Bank and Gaza show up as blank.